RADIO ENGINEER'S POCKET BOOK
'p
RADIO ENGINEER'S POCKET BOOK
By the Same Author
Practical Mechanics Handbook
Diesel Vehicles : Operation, Maintenance andRepair
Workshop Calculations, Tables and Formula
Practical Wireless Encyclopxdia
Practical Motorist's Encydlopadia
Practical Wireless Service Manual
The Superhet Manual
Practical Wireless Circuits
Wireless Transmission
Radio Training Manual
Everyman's Wireless Book
Wireless Coils, Chokes and Transformers
Watches : Adjustment and Repair
Newnes Short -Wave Manual
Motor Car Principles and Practice
Dictionary of Metals and their Alloys
Newnes Engineers' Manual
Flying Reference Book
Wire and Wire Gauges
Gears and Gear -Cutting
Newnes Engineers' Vest Pocket Book
-RADIO ENGINEER'S
POCKET BOOK
BY
F. J. CAMMEditor : " Practical Wireless," " PracticalEngineering," and " Practical Mechanics "
(.1)
3rd Edition
LONDON
GEORGE NEWNES LIMITEDTOWER HOUSE, SOUTHAMPTON ST.,
STRAND, W.C.2.
First Published . July 19402nd Edition . Feb. 19413rd Edition .' April 1941
PRINTED IN GREAT BRITAIN
PREFACE
This Vest Pocket Book ,has been producedto meet the needs of all thpse engaged in thevarious branches of radio-service engineers,students, circuit designers, radio operators,transmitters, constructors, and manufac-turers. The contents were originally pub-lished as a series of data sheets in PracticalWireless, and it is at the special request ofreader4 of that journal that the series is nowissued in the more convenient book -form.I have endeavoured to' include most of theuseful formulae required by those to whomthe book is designed to appeal. The indexis fully cross-referenced to enable the readerrapidly to trace the formula or table herequires.
So far as I have been able to ascertain thisis the first Pocket Book of its type, and itmakes available for radio engineers a similarsource of reference to that in existence forthose engaged in other industries.
Extreme care has been exercised in check-ing the proofs. In order to make this PocketBook as complete as possible I have alsoincluded arithmetical, geometrical, and trigo-nometrical formuke, as well as the usualmensuration formulae, whilst the Englishweights and measures, the metric system,decimal equivalents, slide rule gauge points,wire and other standard tables are included.
F. J. CAMM.5
CONTENTS
PAGEABBREVIATIONS 11SYMBOLS 13UNITS AND PREFIXES 13THEORETICAL SIGNS 14VALVE SYMBOLS 15STANDARD UNITS 16FORCE 17ENERGY 18HEAT 19TIME 19UNIT EQUIVALENTS 20POWER 21ELECTRICAL EQUATIONS 21FREQUENCY . . . . . 22WAVELENGTH OF TUNED CIRCUIT' 22INDUCTANCE 22INDUCTIVE REACTANCE . . . . 22CAPACITY OF VARIABLE CONDENSERS 23H.F. TRANSFORMER RATIO 23CAPACITY OF FIXED CONDENSERS 24OHM'S LAW . . . . ' .. 24RESISTANCES. IN PARALLEL 24RESISTANCES IN SERIES 24CONDENSERS IN PARALLEL 24CONDENSERS IN SERIES . . . 24RESISTANCE, CAPACITY AND INDUCTANCE
IN SERIES 24REACTANCE OF COIL 25REACTANCE OF CONDENSER 25NET REACTANCE 25WAVELENGTH FORMULA 25RESISTANCE OF TUNED CIRCUIT . . 25MAGNIFICATION OF TUNED CIRCUITS : 25CURRENT IN SERIES CIRCUIT . . . 25PEAK SEPARATION (BAND-PASS) . . 25INDUCTANCE OF SINGLE -LAYER COIL. : 25VALVE BASE CONNECTIONS 26VALVE LEG SPACING 31
7
PAGENATURAL WAVELENGTH OF AERIAL . 32REFLECTOR 'AERIALS 32FRAME AERIAL DATA 33LONG -WAVE COIL DATA 34MEDIUM -WAVE COIL DATA 35SHORT-WAVE COIL DATA 36TRANSFORMER DATA 45STALLOY CORE STAMPINGS 45MAINS TRANSFORMER DATA 46CRYSTAL DATA 46CRYSTAL COMBINATIONS . 46RESISTANCES FOR VOLTAGE DROPPING
. 47RESISTANCES FOR DECOUPLING . . . 47ACCUMULATOR DATA . . . . . . . 49CURRENT -CARRYING CAPACITY OF LAMPS 49ACCUMULATOR PASTES . . . . . . . 50NEUTRALISING SPILLED ELECTROLYTE 51JELLY ELECTROLYTE 51H.T. METAL RECTIFIERS 52H.F. METAL RECTIFIERS 53L.T. METAL RECTIFIERS 54DIELECTRIC CONSTANTS 56DIELECTRIC STRENGTHS 55SPECIFIC RESISTANCE OF .MA.TERIALS 56WEIGHT OF SHEET EBONITE . . . . 57WEIGHT OF 1 CUBIC INCH OF METAL 57BRITISH ASSOCIATION SCREWS . . . 58DRILLS AND DRILLING 59TWIST DRILL GAUGE SIZES 60LETTER SIZES OF DRILLS 60WOOD -SCREW PROPORTIONS 61TWIST DRILLS FOR WOOD -SCREWS 61STANDARD WOOD -SCREWS 62WOOD -SCREW PROPORTIONS 63DENSITY OF SOLIDS AND LIQUIDS . 64WAVELENGTH -FREQUENCY CONVERSION
TABLE . . . . . 65STANDARD COLOUR CODES 66INTERNATIONAL " Q " CODE . . . . 68MISCELLANEOUS INTERNATIONAL ABBRE-
VIATIONS 70AMATEUR ABBREVIATIONS 70" QSA " CODE 71" QRK " CODE 71" RST " CODE . . . . ..... 71INTERNATIONAL MORSE CODE . 72
8
PAGEINTERNATIONAL AMATEUR CALL -SIGNS 73PHONETIC ALPHABET 75AMATEUR WAVE -BANDS 76COPPER WIRE DATA . . . . . 77WIRE AND SHEET -METAL fif AUGES . 79RELATIONSHIP BETWEEN DECIBELS AND
POWER RATIO . 83GREEK ALPHABET . . ..... . 83FREQUENCY OF MUSICAL, NOTES . . 84HORSE -POWER 85CHORDS OF CIRCLES . . . . . . 86METALLIC ELEMENTS AND THEIR PROPER-
TIES . . . . . . .. 87FLUXES FOR SOLDERING 90COMPOSITION OF SOFT SOLDERS . . 90COMPOSITION OF HARD SOLDERS . 90TABLE OF DECIMAL EQUIVALENTS . . 91METRIC SYSTEM . . . . 92METRIC CONVERSION FACTORS . . . 93EQUIVALENTS OF IMPERIAL AND METRIC
WEIGHTS AND MEASURES 95MENSURATION 97TRIGONOMETRICAL FORMULZE . . . 102TRIGONOMETRICAL EQUIVALENTS . . . 16TRIGONOMETRICAL FUNCTIONS . . . . 106TABLE OF SLIDE RULE GAUGE POINTS 107POWERS AND ROOTS OF AND g . . 110POWERS AND ROOTS . . . . . . . 111RESISTANCE OF METALS AND ALLOYS . 114ENGLISH WEIGHTS AND MEASURES . 116NATURAL SINES, COSINES AND TANGENTS 119LOGARITHMS 125ANTILOGARITHMS . . ... 129INDEX 133
Larair.mar....
9
..111-,..-.-....=3.a,,,,..............----,--,.-.1,,,
RADIO ENGINEER'S POCKET BOOK
ABBREVIATIONSA.-Anode, or plate.A.A.-Artificial aerial.A.C.-Alternating current.Ae.-Aerial.A.F.-Audio frequency.A.F.C.-Automatic frequency control.A.G.C.-Automatic gain control.A.M.-Amplitude, modulation.A.T.C.-Aerial tuning condenser.A.T.I.-Aerial tuning inductance.A.V.C.-Automatic volume control.A.V.E.-Automatic volume expansion.B.A.-British Association.B.C.L.-Broadcast listener.B.F.O.-Beat frequency oscillator.B.O.T. Unit-Board of Trade unit
= 1,000 watt-hours, or 1 kilowatt-hour.
B.W.G.-Birmingham wire gauge.C.C.C.-Closed circuit or secondary
condenser, or S.T.C.C.C.I.-Closed circuit or secondary tun-
ing inductance, or S.T.I.cm.-centimetre.C.P.-Candle power.C.W.-Continuous waves.D.A.V.C.-Delayed A.V.C.db.-decibel.D.C.-Direct current.D.C.C.-Double cotton covered.D.E.-Dull emitter.D.F.-Direction finding, or direction
finder.D.P.-Difference of potential.D.P.D.T.-Double pole double throw.D.P.S.T.-Double pole single throw.
10
RADIO ENGINEER'S POCKET BOOK
ABBREVIATIONS-(continued)D.S.C.-Double silk covered.DX-Long distance.E.-Earth.E.M.F.-Electro-motive force.F.-Filament.F.M.-Frequency modulation:G.-Grid.G.B.-Grid battery or grid bias.G.C.-Grid condenser.G.L.-Grid leak.H.F.-High frequency (same as radio
frequency).H.F.C.-High-frequency choke.H.P.-Horse power.H.R.-High resistance.H.T.-High tension.I.C.-Intermittent current.I.C.W.-Interrupted continuous waves.I.F.-Intermediate frequency.I.P.-In primary (of transformer) ;
start of primary.I.S.-In secondary (of transformer) ;
start of secondary.kw.-Kilowatt = 1,000 watts.L.F.-Low frequency.L.F.C.-Low-frequency choke.L.R.-Low resistance.L.S.-Loudspeaker.L.T.-Low tension.mA.-Milliampere.M.C.-Moving coil.mfd.-micro-farad.mhy.-microhenry.mm.-millimetre.mmfd.-micro-micro-farad.
11
RADIO ENGINEER'S POCKET BOOK
ABBREVIATIONS-(continued)0.F.-Outside Foil.O.L.-Output load.O.P.-Out primary (of transformer) ;
end of primary. Also output.O.S.-Out secondary (of transformer) ;
end of secondary.P.-Plate, or anode.P.A.-Public address.P.D.-Potential difference, same as D.P.P.M.-Permanent magnet.Pot.-Potentiometer.P.V.-Power valve.Q.A.V.C.-Quiet automatic volume con-
trol.Q Code.-See pp. 68 & 69.Q.M.B.-Quick make and break.Q. P.-P.-Quiescent Push-pull.R.F.-Radio frequency (same as high
frequency).R.M.S. Value.- Root -mean -square
value.Ftx.-Receiver.S.C.C.-Single cotton covered.S.I.C.-Specific inductive capacity.S.P.-Series parallel.S.P.D.T.-Single pole double throw.S.P.S.T-Single pole single throw..S.R.-Specific resistance.S.S.C.-Single silk covered.S.T.C.-Secondary tuning condenser.S.T.I.-Secondary tuning inductance.S.W.G.-Standard wire gauge.S.W.L.-Short-wave listener.T.R.F.-Tuned radio frequency.T.T.-Tonic train.Tx.-Transmitter.
12
RADIO ENGINEER'S POCKET BOOK
SYMBOLSAdmittanceAmplification FactorCapacityCurrentConductanceDielectric ConstantEfficiencyElectrostatic Flux DensityE.M.F. (voltage)EnergyFrequencyImpedanceMagnetic FieldMagnetic FluxMagnetic Flux DensityPeriod TimePermittivityPhase AnglePowerQuantityReactanceReluctanceResistanceResistivitySelf-inductance
V
6
W
11
B
P
SR
UNITSAmpere AAmpere -hour AhB.O.T. Unit - 1,000 watt-hours, or 1 kilo-
watt-hourCoulombFaradHenryJouleKilovolt -ampere kVAOhmVolt V
VAVolt-ampereWattWatt-hour Wh
PREFIXESKilo liMega MMicro AMilli m
13
RADIO ENGINEER'S POCKET BOOK
THEORETICAL SIGNS
TT NT, , ,td.-Cat0E,SERS AWC, Con HFC aareCcw,99
Kf1,,,Onc'cm!, RffiJryCL
4 "
4"'" Rrcigi" P"'""
AvoroCea 4
14
f1g'ffc? dfiC,QOPNars
CR.j ram
RADIO ENGINEER'S POCKET BOOK
VALVE SYMBOLS
7.2
Doveca.0,,00etP.vroax
&At,.5Caez 0 64,0 ,Enro.0
7.7wooe&pro. th7,44, h'ExoDe Pe.Nrooe
HALF W.L.Recrm-hca
110:,15,';`: v111.,
e
PErirODE
CiAss:g
1,4x.1 Tx'
15
RADIO ENGINEER'S POCKET BOOK
STANDARD UNITS.Ampere.-Unit of current. A pressure of 1 -volt will pass
a current of 1 -ampere through a resistance of 1 -ohm (seeOhms Law). It represents a flow of 1 coulomb per second.
Ampere -hour. --Unit of quantity of electricity, equalto 3,600 coulombs. One unit is represented by a currentof one ampere flowing for one hour.
Board of Trade Unit (B.O.T.).-The Board of TradeUnit is 1,000 watt hours, and is equal to 3,415 BritishThermal units.
Coulomb.-Unit of quantity of electricity. It is equalto one -tenth of an absolute electromagnetic unit.
Dyne.-C.G.S. unit of force. The force which whenacting on a mass of 1 gramme imparts to it an accelerationof 1 centimetre per second per second.
Erg.-C.G.S. unit of work. Equal to 1 dyne -centimetre.Farad.-Unit of capacity. A condenser has a capacity
of 1 farad when a charge of 1 coulomb raises the potential1 volt. In wireless the practical unit is the microfarad(.000001 farad) sub -division is the micro -micro -farad = -000,000:000,001 farad.
Henry.-Unit of inductance. It is the unit of mutualinductance or self-inductance in the electromagneticsystem. The henry is equal to 10' C.G.S. electromagneticunits. It represents the inductance of a circuit in whichan induced electromotive force of 1 international volt iscreated when the current in it varies at the rate of 1international ampere per second.
International Ampere.-The practical unit of electriccurrent representing the unvarying current which whenpassed through a neutral solution of nitrate of silverdeposits silver at the rate of 0.001118 of a gramme persecond.
International Coulomb.-Practical unit of electricquantity, representing the quantity of electricity trans-ferred in 1 second by a current equal to the internationalampere.
International Farad.-The practical unit of capacityrepresenting the capacity of a condenser which is chargedto a potential of 1 international volt by imparting to ita quantity of 1 international coulomb.
International Oh m.-Practical unit of resistance,representing the resistance offered to an unvarying currentof electricity by a column of pure mercury at the tem-perature of melting ice having a mass of 14.4521 grammes,a constant cross-section, and a length of 106.3 centimetres.
16
RADIO ENGINEER'S POCKET BOOKInternational volt.-Practical unit of electromotive
force, representing that E.M.F. which when steadilyapplied to a conductor having a resistance of 1 inter-national ohm creates in it a current of 1 internationalampere.
International watt.-The energy7used in 1 second byan international ampere when flowing at a pressure of1 international volt.
Joule. Unit of energy. One joule equals 10' ergs.It represents the work expended per second on a circuitin which there is a current of 1 international ampere,and between the ends of which there is a difference ofpotential of 1 international volt.
Kilovolt -Ampere. -1,000 -volt amperes.Kilowatt. -1,000 -watts or 1.34 horse -power.Kilowatt -hour. -1,000 -watt hours.Line.-The practical method of measuring a magnetic
field is in lines or kilolines. The line is identical with1 electromagnetic unit of magnetic flux ; kiloline equals1,000 lines.
Mho.-Unit of Conductance (" ohm " reversed). It isthe reciprocal of the ohm. Thus, a body having a resis-tance of 4 ohms would have a conductance of .25 mhos
Ohm.-Unit of Resistance. The resistance which willpermit the flow of 1 ampere when a pressure of 1 volt isapplied.
Unit Electrostatic Charge.-The charge which in avacuum at a distance of 1 centimetre from an equalcharge will produce a force of repulsion of 1 dyne.
Unit Electrostatic Flux.-The electrostatic flux existentin a unit electrostatic tube of force.
Unit Magnetic Flux.-The magnetic flux existent in aunit magnetic tube ' of force. Unit is the Maxwell.
Unit Magnetic Pole.-That pole which located in avacuum at a distance of 1 centimetre from a like poleproduces a mechanical force of repulsion of 1 dyne.The total number of lines of force which passes througha unit magnetic pole equals rr.
Volt.-Unit of potential. It is the pressure required topass a current of 1 ampere through a resistance of 1 ohm.
Volt-Ampere.-The product of the root mean squarevolts, and root mean square amperes.
Watt.-Practical unit of power equivalent to a rate ofworking of 1 joule per second or 10,000,000 ergs persecond. Volts times amps equals watts.
Light, Speed of.-Light waves travel at 186,000 milesper second. This is the speed also of wireless waves.
Sound, Speed of.-Sound waves travel at 1,142 feetper second.
17
RADIO ENGINEER'S POCKET BOOK
FORCEThe absolute unit of force is the Poundal,
which is that force, acting for unit time,which would impart unit velocity to unitmass.
1 dyne =0.00007233 poundal.1 dyne =0.00102 gram.1 dyne =22.48 x 107 pounds.1 megadyne =1,000,000 dynes.1 poundal =13,825 dynes.1 poundal =0.03108 pound.1 poundal =14.10 grams.
ENERGYEnergy refers to capacity for performing
work, or for moving against a resistance.1 erg =2.373 x 10-6 foot
poundals.1 erg =7.376 x 10-8 foot
pounds.1 g.cm. =7.233 x 10-8 foot
pounds.1 joule =107 ergs.1 foot poundal =421.390 ergs.1 foot pound =1.35573 joules.1 foot pound =13,825.5 g.cm.The actual energy, Kinetic energy,
or dynamic energy of a moving body= mass x velocity 2.
la
RADIO ENGINEER'S POCKET BOOK
HEATA therm is the heat equz7valent of an erg
on the C .G.S. system.The Centigrade Heat Unit (C.H.U.)
is the heat required to raise llb. water 1°C.A calorie as used in engineering cal-
culations represents the heat required toraise 1 kilogramme of pure water 1°C.This is the Great Calorie. The SmallCalorie represents the heat required toraise 1 gramme of water 1°C.
1 calorie (g.c.) =0.0039683 B.T.U.1 calorie (g.c.) =4.1862 joules.1 calorie (g.c.)=3.088 foot lb.1 calorie (g.c.)=-0.005614 horse -power
second.1 B.T.U.=252.00 calories or 0.252
kilogramme calories.1 B.T.U.=1,055 joules.1 B.T.U.=778.1 foot lb.1 B.T.LT.=1.4147 horse -power second.1 C.H.U. =1.8 B.T.U.
TIME1 sidereal second=0.99727 second
(mean solar).1 second (mean solar)=1.002738
sidereal second.Length of seconds pendulum latitude
45° -= 39.1163 in. 99.3555 cm.
19
RADIO ENGINEER'S POCKET BOOK
UNITS AND EQUIVALENTSOne ft. lb. . . .1 lb._raised 1 foot high.One BTU 1,055 joules.One BTU 778,1 ft. lbs.1 watt 10' ergs per second.1 watt 23.731 foot poundals
per second.1 watt 0 7376 ft. lb. per second.1 watt 0 001341 h.p.One HP hour . .0.746 kW. hour.One HP hour . .1,980,000 ft. lbs.One HP hour . .2.545 BTU's.One kwH. (kilowatt hour)
2,654,200 ft. lbs.One kwH. . . . .1,000 watt hours.One kwH. . . . .1.34 HP hours.One kwH. . . 3,412 BTU's.One kwH. . . . .3,600,000 joules.One kwH. . . .859,975 calories.One HP 746 watts.One HP 0 746 kW.One HP 33,000 ft. lbs. per minuteOne HP 550 ft. lbs. per second.One HP 2,545 BTU's per hour.One HP 42.4 BTU's per minute.One HP 0 707 BTU's per second.One HP 178,122 calories per
second.
20
RADIO ENGINEER'S POCKET BOOK
POWER1 watt =107 ergs per second.1 watt =23.71 foot pound -
Js 'per sec.1 watt =0.7376 foot lb. per
second.1 watt =0.001341 h.p.1 kilowatt-hour =2,654,200 f o o
pounds.1 kilowatt-hour =1.3411 h.p. hour.1 kilowatt-hour =859,975 calories.1 foot poundal per -421.390 ergs per
second second1 foot pound per
second =1.35573 watts.1 horse -power =746 watts.1 horse -power =550 foot pounds per
second.1 horse -power =178.122 calories per
second.
ELECTRICAL EQUATIONSAmperes x volts =watts.Joules = seconds =watts.Coulombs per
second =amperes.Watts ± 746 =effective h.p.Coulombs ± volts =farads.0.7373 foot -lb. per
second ' =1 joule.Volts x coulombs =joules.Watts x 44.236 =foot -lb. per minute.Kilowatts x 1.34 =h.p.
21
RADIO ENGINEER'S POCKET BOOK
Frequency Formula
Forniula for frequency is : f - 106 where L = in-2.7tv LC,
ductance in microhenrys and C = capacity in micro -farads.
Wavelength of Tuned Circuit.Formula for the wavelength of a tuned oscillatory
circuit is : 1884.96V LC, where L=inductance inmicrohenrys and C =capacity in microfarads.
InductanceThe formula for inductance in microhenrys is:
9.861D2N2K,L- 1000 where L =inductance, D =diameterof coil in centimetres, 1=length of coil in centimetres,N= number of turns per centimetre, and K =aconstant. See table.
_.Inductive ReactanceCalculated from the formula 2.7-CfL, where f=fre-
quency and L=the inductance.This Table shows the Value of K, which must be
Calculated from D
D- K1)- K
1 1
4.00 .3654 1.25 .63813.75 .3743 1.00 .68843.5 .3944 .90 .71103.25 .4111 .80 .73513.00 .4292 .70 .76092.75 .4545 .60 .78852.5 .4719 .50 .81812.25 .4972 .40 .84992.0 .5255 .30 .88381.75 .5579 .20 .92011.5 .5950 .10 ' .9588
22
RADIO ENGINEER'S POCKET BOOK
C-1,000,000 d!Where N=Number of moving .vanes.
S =Area of one moving vane in squarecentimetres.
d =Air gap between moving vanes andfixed vanes in centimetres.
Capacity of Variable Condensers
.0885NS
H.F. Transformer Ratio. (n) n2 --- Ro11 being the dynamic resistance of the tuned circuit
and Ro the A.C. resistance of the valve.
Stability in Screen -Grid Stages.One Stage.
Stable ifcra:Co is less than 2.
(0'2+ cn)Co=residual anode -grid capacity in farads.
=.001 x 10-14 for Cossor S.G. Valves (alltypes).
=.0045 x 10-" for Cossor MS/Pen A.61,62 =conductance of grid and anode* circuits
respectively.=1/R where R=dynamic resistance in ohms.
av-anode filament conductance of valve.=1/Ro.
Two Stages.Assuming identical tuned circuits throughout,
and ignoring damping effects of valves on tunedcircuits.
Stable if0.) Co0'2 g
is less than 1.14 (Tuned Anode).
or if fi)C2Co g less than 1.14n2 (Tuned Trans-
former).where a = conductance of tuned circuit (secondary)
and n=transformer ratio.* In the case Hof transformer coupling, or its
equivalent, replace as by n26, where n=transformer,1
ratio, a = conductance (= -1-.) of tuned secondary.
23
RADIO ENGINEER'S POCKET BOOK
Capacity of a Fixed CondenserC_.0885 AEN
1,000,000 d.Where K =Specific Inductive Capacity of dielectric.
N= Number of dielectrics.Area of overlap of plates in square centimetres.
d = Thickness in centimetres.Another Formula :
AKN4,500,000 d.
Where A.= Area of one plate in square inches.K=S.I.C. of dielectric.N= Number of plates minus one.d= Thickness of dielectric in inches.
OHM'S LAWFor D.C. For A.C.
/=-E where Z=impedanceof circuit.Watts dissipated. Watts dissipated.
= PR= EI. = I2RE I cos 0
where 0= phase anglebetween E and I.
Capacity of Condensers in Parallel.C= C11- C2
Capacity of Condensers in Series.1
-1+-1 Ci+ C2Cl C2
Resistances in Parallel.
R= 1 RjR21 +1 Ri+ B2Itl 112
Resistances in Series. R- R5+ R,Resistance, Capacity and Inductance in Series.
Resulting Impedance.
)Z = R2 (coL 2 112+ X'(0C
24
RADIO ENGINEER'S POCKET BOOK
Reactance of Coil. 274 L.7C, 3.14 ; f, frequency ; L, inductance in henrys.
Reactance of Condenser. 1._27rfC
C, capacity in farads.Net Reactance.
Al Resonance, f- 1, or (.02=-1
2rVLC LC
Wavelength. A=1884 'PLC2, in metres L, in microhenrys ; C, in micro -farads ; A x f = 300,000,000.
Resistance of a Tuned Circuit at Resonance (Dy-namic Resistance).
R= I.C x r
r being the equivalent series resistance.Magnification of Tuned Circuit. nt=c11.
Current in Series Circuit at Resonance. / _E
where r is equiv. series resistance of circuit atwavelength concerned (high -frequency resistance).
Peak Separation (Band-pass Tuners).Vw.M2-r2P- cycles (inductive coupling).
2scLw = ; 31, mutual inductance in henrys ;
r, equivalent series resistance of tuned circuit ;L, inductance in henrys.
V 1 2-rc.2= Cm,2 cycles (capacity coupling)
2,7cLCm--= coupling capacity in farads.
Inductance of Single Layer Coil.L =rr2n2D21k +10-8
L, in microhenrys ; n, 3.14 ; D, diameter intins. ; number of turns to the cm. ; 1, lengthin cms. ; k, a factor depending upon the length/diameter ratio.
DWhen-=0.1 0.5 1.0 2.0 3.0 4.0
k =0.90 0.82 0.69 0.526 0.429 0.365
25
87 S°.
Pave dooResS
(O/
S4F A/0
RADIO ENGINEER'S POCKET BOOKAbbreviations used in Table on pages 28 and 29,.
T.H.-Indireetly heated. D.H.-Directly heated.M.-Metallising. F.-Filament.H.-Heater. C, Cl, etc.-Cathodes.A, Al, etc.-Anodes (Ao-Oscillator anode).G or Gl-Control grid (Go-Oscillator control grid).G2-Screening grid. G3-Suppressor grid.
1), Dl, etc.-Diodes (anodes).Valve Base Connections for American (Octal) Valves.
Valve Type BasePin Connections .
1 2 3 4 5 6 7 8 TopCap
Triode .. I.H. Oct. 31 H A- 0 - H C -Triode .. I.H. Oct. M H - A .- - H C 0H.F.PentodeLH. Oct. Id H A G2 03 - H C 01Output PentodeI.H. Oct. NI H A G2 GI - H C -Heptode I.H. Oct. 3I H A 03 Go A,) H 0 04
G5 (011 (G2)Double -diode
I.H. Oct. 31 H D2 C2 DI - H Cl -Double -diode -triode I.H.Oct. Al H A Dl D2 - H C 0Rectifier, Fullwave .. I.H.Oct. AI. H - A - A - H, C -Rectifier, Fullwave .. LH. Oct. - H H A2 C2 Al - Ii, CI -Rectifier, Fullwave .. I.H. Oct. 31 H A - A - H C -Rectifier, Full -wave. Gaseous) Oct II - A - A - - C -
Valve Base Connections for Acorn and Deaf -AidValves.
Type BasePin Connections
1 2 3 4 5 Top Bottom
ACORNTriodeH.F. Pentode ..
DEAF AinTriode (D.H.)Triode (1.H.)Triode (Milliard)
PUBLIC ADDRESSTriode ..
11
223
4
HH
AAA
A
C
C
G
CG
F G
H11
FHF F
S
FIf
F
ASG A
26
RADIO ENGINEER'S POCKET BOOK
3 2
5 4. 5 4.Loc4r,e8 LOCA7.4M74.4w MARK
leryPe OCTAL. ACORN4
\ \.3
52 4
113
4O
2 t-/
6 7 5(SioE Ccwr,scr VALVES)
5M2
3 4;,/c vac 'M/OGEES
4M
3
2
4
Louisa..144/0/C
&.a' A/0
ConinNeNzw,
No / 7YRE No 2 i'YPE2 3 2 - 3
Valve -contact arrange-ments for all types ofvalves. (Seo tables onpages 26, 28, 29, and
30, etc.)
27
VA
LV
E B
ASE
CO
NN
EC
TIO
NS FO
R ST
AN
DA
RD
(R.V
.A.) V
AL
VE
SSee
definitions of abbreviations used..
-
Piet Com
m,.lione
Valve T
ypeB
aseT
op!'
34
56
78
9C
ap1
Triode
....
.. D.H
.4
A0
FF
--
-- -
Triode
....
..I.H
.5
AG
HH
C-
-T
riode..
....
I.H.
7IL
L-
--H
HC
A-
Tetrode
....
.. D.H
.4
G2
(11.F
F-
--
-A
Tetrode
....
..I.H
.5
G2
01H
HC
--
- AH
.F. Pentode or Tetrode .. D
.H.
731
G1
G3
FF
-G
2-
-A
H.F. Pentode or T
etrode..
I.H.
5G
O01
HIf
C, G
O-
-- - A
H.F. Pentode or T
etrode..
I.H.
7M
01G
3II
HC
G2
- - AH
.F. Pentode or Tetrode
..I.H
.7
31A
G3
HH
CG
2- - G
lH
.F. Hexode
D.H
.7
MA
G3
FF
04G
O- -
GI
Output Pentode
.... D
.H.
4A
G1
FF
--
-- G
OO
utput Pentode..
.. D.H
.5
A01
FI,
G2
--- -
Output Pentode
....
I.H.
5A
01H
HC
--
- G2
Output Pentode
....
I.H.
7-
G1
02H
IIC
A- -
Ffeptode..
.... D
.H.
7A
-,G
o02
F1,
-A
- 01H
eptode..
....
I.H.
7A
oG
oG
2II
HC
A-
(41O
ctode..
.... D
.H.
7G
201
G3, 05
FF
M, 06
A-
(44O
ctode..
....
I.H.
702
0103, G
IH
IIC
, 51, G6
A- G
4C
lass B O
utput..
..D
.H.
7G
OG
IA
lF
I,-
A2
---
Double-diode ..
.. D.H
.4
Dl
D2
FF
--
a
00en
Urt
`"(79
00cc
Double -diode
....
I.H.
Double -diode -triode
.. D.H
.D
ouble -diode -triode..
I.H.
Triple -diode -triode
....
I.H.
Si ngle-diode-tetrode..
LH
.T
riode -pentode..
.. D.H
.T
riode -pentode..
..III.
Triode-hexode
....
D.H
.
Triode-hexoide,
....
I.H.
557979977
Dl
ADl
D2
-.
G2
02Ao
Au
D2D2MD:3
(41
Al
Al
Go
Ge
HF, 31D
2-02G3
03G
O
G2
11FIIHHFIIFIl
CDl
HIfIII,HFH
--CC
C, 11-CMC
--AADAu
AoAA
-Dl
-Go
Go--
-M-M31---
G0AGIGI
Gl
GI
,
Double-pentod4
.... D
.H.
7G
l.C
l'A
lF
F021 G
2=A
S-
G1'-
Double -pentode
,.
... D
.H.
9011
Al
G21
FF
-62.
. A2
31-
Double-diode-H
.F. PentodeI.H
.9
G2
A-
IfH
C, G
3D
1D
2-
01D
ouble -diode Output Pentode L
H.
7D
1A
D2
HII
CG
2-
-G
ID
ouble -diode Output Pentode I.H
.7
DI
CD
2H
HA
G2
--
01R
ectifier, Half W
ave.. D
.H.
4A
FF -
--
-R
ectifier, Half W
ave (H. V
olt) D.H
.4
-F
I,-
--
-R
ectifier, Half W
ave., ....
LH
.5
AH
11C
--
--
Rectifier, H
alf Wave (1. V
olt)I.H
.4
-H
, C11
--
--
Rectifier, Full W
ave ....
D.H
.4
AA
FI, -
--R
ectifier, Full Wave
..L
II.4
AA
II, CH
---
-R
ectifier, Full Wave
..L
H5
AA
HI{
C-
-R
ectifier, Full Wave
..I.H
.7
H,C
,TA
lC
lH
HC
2A
2B
arretterT
uning Indicator (C.R
.)..
I.H.
70
Targ.
HII
CA
RADIO ENGINEER'S POCKET BOOK
Vaive Base Connections for Continental Valves. See p.26.
Type BasePin Connections.
1 2 3 4 5 6 7TopCap
H.F. PentodeH.F. PentodeTriode . :
Double -diodeFreq.Changer0. Pentode ..O. Pentode ..Rectifier ..Rectifier ..
1
22221
212
G2G2-G20202G2ClCl
HIIHHHHIIIIII
HHHHHII1-1
HH
0CCCCCC
C2C2
AAADlAAA
A2A2
G3hi
111-Ao
G1 G3G3.Al-
-G301-Go-GI-Al
01GI-11201----
Valve Base Connections for Hivac Midget Valves.I
Type !BasePin Connections
1 2 3 4 .5TopCap
Tetrode (S.G.) ..Triode .. ..Output Pentode ..
1
1
2
AG2A
G01Gl.
FFF
FFF
--02
-A-
Mullard Universal Side -Contact Valves
Valve Type BaseContact Connections
1 2 3 4 5 6 7Top
8 Cap
Triode ..II.F. PentodeO. Pentode . .
Octode ..
Double -diodeDouble -diodeRect., Half -wave ..
Rect., Volt.Doub. ..
V. T. Indica-tor (TV4)..
PPP
P
VV
P
P
P-
M HM H- IIM II
D2 HINI H
-HCl II
H
H CH C11 C
03H C,
G6H C, AlH CH CH C2
H C-
--G3-G2
DlD1
-Al
--G1
----0
-G2G2
G3G5-----
Target
A GA G1.A GIA 04- -
D2
A -- -A -
30
RADIO ENGINEER'S POCKET BOOK
Valve -leg spacing for stan-dard 4- and 5 -pin valves.The diameter of the valve
pins is 3.2 mm.5M
4 M.
The two diagrams aboveshow the valve -leg spac-ing for the III vac Midget
valves..I.020=1:=.2.1.2.
/8MM
II/Z..".2,9orro
St...1.7 UV,
Valve -leg spacing for7 -pin valves.
760
Valve -leg spacing9 -pin valves.
RADIO ENGINEER'S POCKET BOOK
AERIAL DATANATURAL WAVELENGTH. - The
natural wavelength of an aerial isapproximately four and a half times itselectrical length (length between insu-lators plus length of lead-in). Standard,.aerial of 100ft. has a natural wave-length of 05 -out 120 metres. If con-nected direct to the grid of the detectorvalve, it would receive transmissions onthis wavelength.
The maximum length of aerial, in-clusive of lead-in, permitted bye thePostmaster -General is 150ft.
REFLECTOR.-An arrangement gen-erally employing a dipole aerial, forpreventing a signal from being radiatedin all directions, or for ensuring maxi-mum reception in a given direction. Itconsists of a vertical or horizontal aerialbehind which is erected a similar aerial(not connected to anything), the spacingbetween these being adjusted accordingto the frequency of the signals. Amulti -reflector system will generally havethe reflectors arranged in the form of aparabola with the aerial at the focalpoint.
Stranded 7/22 insulated' copper wireis best for both aerial and lead-in.
32
RADIO ENGINEER'S POCKET BOOK
$=..,D tiE3F+0 }.,-.......,
°c
R
0 '12 cp Or:.1. SiP000Z, 't,
-1
0 0 c9-EV45, 0 oo o. w °
&'.,71- CD es. sp c,
C4 ;0m
0 ...);1."0 .- (DwzrQ4ci,'">4 .÷
11XI
''-' '" ''''' `,-
,A.tz
-e arCD CO cl- 00 .-1 0 0"z.n,1,--0 0rzr' e' c'''
0 IQ (.' P ri.e"0 0 o
' .1 " 5 ?) g
''<, Ill
lalIn
-t..-.
'4....-
0"0 P 0 " 1-, . ,-,CC, Cw, ts0 CD
.....?gl -
0 t3 0 °a, P cog,C-Laq 0 P2-, ct (T,
Z0 PP5.
. -
>-12-, c,
.,,,s'.
O'0"0 P 00 0 0p:L5/2.'''''g
,:":
C/2 '.0 0 --1 CD 02fd P Cst-,0 rn0 z .-. +.00 P <I .)trq0 mme,
CtfD 0-,-d ,__,,_,
Z°-:
(t) 0 Me., it g, c+ 0 0 0.4,Z ?.?, V, ci: 81..,...t.
0 CD 0-'0''xc+0 CD CD "'..
<.:1 l'
33
00co
U I-.
z0eg
LON
G -W
AV
E C
OIL D
AT
A
Inductance1,600 M
icrohenryq.Inductance
2,100 Microhenrys.
........7Inductance
3,000 Microhenrys.
Dia-
meter of
Former
No. of
Slots.W
ire.T
urnsperSlot.
No. of
Slots.W
ire.T
urnsper
Slot.N
o. ofSlots.
Wire.
Turnsper
Slot.
1 in.45
36 enam.
36 D.S.C
.8069
4536 enam
.36 enam
.9280
5638 D
.S.C.
36 enam.
9585
11 in.345
36 D.S.C
.36 D
.S.C.
34 D.S.C
.
715753
345
36 enam.
36 D.S.C
.34' enam
.
816560
345
36 enam.
36 enam.
36 D.S.C
.
977872
2 in.
_.36345
34 enam. or
36 D.S.C
.84 D
.S.C.
34 D.S.C
.
564538
345
36 D.S.C
.
34 D.S.C
.34 D
.S.C.
655144
345
36 enam.
36 D.S.C
.34 enam
. orD
.S.C.
77
6153
OOU2ce14,
0 z0
ME
DIU
M -W
AV
E C
OIL D
AT
A
Inductance175 M
icrohenrys.Inductance
200 Mlcrohenrys.
Inductance
.......230 M
icrohenrys.
Dia-
Length
Length
Length
meter of
Wire.
Turns
in.W
ire.T
urnsin
Wire.
Turns
inForm
er.inches.
inches.inches.
li in.1,3Q,
32 enam.
D.S.C
.8493
1.011.38
32 enam.
30 D.S.C
.93
1021.111.52
30 D.S.C
.32 enam
.115102
1.711.22
;11 '"'30'D
,S.C.
28 D.C
.C.
74941.102.24
30 D.S.C
.82
1.2230 D
.S.C.
901.34
30 D.S.C
.63
0.9430 D
.S.C.
681.01
30 D.S.C
.76
1.1311 m
.28 D
.S.C.
671.16
28 D.S.C
.73
1.2628 D
.S.C.
801.38
2in.
30 D.S.C
.28 D
.S.C.
54580.8051.01
30 D.S.C
.28 D
.S.C.
5964
0.881.13
30 D.S.C
.28 D
.S.C.
65700.971.24
26 D.C
.C.
701.96
26 D.C
.C.
782.18
26 D.C
.C.
862.40
2i in.28 D
.S.C.
520.925
28 D.S.C
.57
1.0128 D
.S.C.
621.10
24 D.C
.C.
652.08
24 D.C
.C.
722.30
24 D.C
.C.
802.56......
21 ` , "'28 D
.S.C.
24 D.C
.C.
47580.8357.85
28 D.S.C
.24 D
.C.C
.5164
0.912.04
28 D.S.C
.24 D
.C.C
.5670
1.02.24
3in.
26 D.S.C
.22 D
.C.C
.4150
0.861.90
26 D.S.C
.22 D
.C.C
.4555
0.952.09
26 D.S.C
.22 D
.C.C
.4961
1.032.32
iQ
0002PLZ'
az<
SH
OR
T-W
AV
E C
OIL D
AT
A`5.,
.0.,
-0
QC
;
.6.uj
tT1M
'0
.(1
0.pAg,
.,. (3,6
g.4:4
,-,0 bo..°O
R,
,,...
02
zE-i
Tuning R
ange (Min. C
ap. 30 =M
d.).0001
.00015.00035
Min.
Max.
Max.
Max.
1"99,,',,,,r"99
1829,,1899
1899
10+99
>,
i61
,,99
1.0,,19
rr1"1111"r1"
1"11"11"1/'1"
1"11"
5±7/10113+151517/
10113+1515/71
10+13+
59
1116
61111
14122
7113+
1726
8115+
1930
9118
21+33
6/121
151241
9117
20+32
1120
24+37
12123
2843
14126
31148
8141
171261
101191
23136
12123
2843
141261
3250
CD
00F-
21')cLz z5
SH
OR
T-W
AV
E C
OIL D
AT
A-(continued)
1ot,
ilgo.
6bi,
,..,
d,..110or,
.62
.
za
e`30
,,,N0422,,,,,.,,,cn
P52w-
02PH4
Tuning R
ange(M
in. Cap 30 m
mfd )
.0001.00015
.00035
E-5,ill
pM
in.M
ax.M
ax.M
ax."
18101
11"151
16130
3665
1"18
1011"
5181
16191
30y,
1"71
12211
2640
,,',1
,,,1"
10114
25131
47,,
1113+
1630
35155
11"151
1833+
4062
1"1"18
l'o-if'
5+10+
1923+
369>
r71
14126
311491
,,99
/21"
10117
311381
58,,
9992
11"13±
2036
4466
14"18',;101
11'1'15161
2342
5073
1222
2741
,,,,
1"71
16130
3756
1"101
2036
4467
00Uzz OC
0
SH
OR
T-W
AV
E C
OIL D
AT
A-(continued)
ii ,-,,;P, f5.r.',
(50Z
.gli
NW
csg,0
. u) 8E
4 ' g Ui
0,, g,,,,.,_,E
g aCi
''''o60
4..E!
4N,-1
,..,G13''
''E-
Tuning R
ange(M
in. Cap. 30 m
mfd.)
...."01 Max.
.0P,01.-
.'?4M5.
le1,, ,,,A-
472
,,,Pi -0
1820f,,P
20, ,3,,f
20
101
1417f ,
fl
aff,Ptf
14fl
11"II"r
fi
1"11"Ir1"4"1"11"11"r-3'
13*1517
1011417121710214171217101
2343
5278
26148
5890
6112
14k22
8116
1929
1018k
22134
11121
2540
13231
2945
917
2132
12.22
2742
1427
3350
1730
3757
1935
4265
1119
2335
1425
31148
SHO
RT
-WA
VE
CO
IL D
AT
A-(continued)
$,-,cs 0-'du
a't,,
?:',13f)°,,,,
0.
po
.A" r'i
.zc,.
a .0
ce>cl
,-.pi.
'a, cdui0') a-'E
.,-, cen
.n.2tp-2g ..-,'''.4
0c0Z E
,
Tuning R
ange(M
in. Cap. 30 m
mfd.)
Min.
Max.
.015.215
i"A
2014
1"14
1730
3757
,,,
11"171
19341
42165
,,,1k"
2122
4048
721"
2014
r7
11121
2640
,/,/
,,3"
1011151
28341
53,,
,,,,
1"14
1.8234
4163
1,)7
f,13"
17121/
3948
71'11"
2124
4554
821,"
20a
3"7
1425/
3147
,,>
,/7
r101
1935
4365
PI1,
1,1"
1423
4251
74,1
f,,,
13"171
27481
5990
,,,,
,,11"
2130
5567
103
00wzz Ui
cc
SH
OR
TW
AV
E C
OILv D
AT
A-(continued)
'Z'
0,-.
ai oQ
.
60.t'D
'S'6
r,,S`r6
1:1,0,.
2,-.0
Fjg R cq
6E
..-9 c`r'c'.4'
,..o bi,4..9
g 5.4
,.....
.26ZH
Tuning R
ange(M
in. Cap. 30 m
mfd.)
Min.
Max.
.glel.15M
ax.
I Z2!22I"22rrPI
20,,2225
22,,22292
14.,2/2229
1892PP
187
92
1"i-"1"11"11"- -"r1"11"
11."1"
1"
7
10114171219131
18221279
13118
1629
35154
2240
4973
26148
5990
3156
69105
3563
78120
8115
18128
1120
2538
1324
2944
1527
3351
1731
3757
12211
2640
1629
35541
1934
4264
O
SH
OR
T-W
AV
E C
OIL D
AT
A-(continued)
1"
ui
22g
222222
22122222
22
22
18
18
0 bo
fig
t,vg54
11"11"
1"
1;lri"
oN
ZP
Tuning R
ange.0001
Min.
Max. (M
in. Cap. 30 m
mfd.)
.00015.00035
Max.
Max.
22122
4048
7227
2545
54182
913/
2530
45131
1832
4062
1822
4047
71
22125
4555
8227
2850
6292
915
2733
50131
2036
4568
1824
4453
81221
2750
6192
27311
5770
1079
1833
4051
.S
HO
RT
-WA
VE
CO
M. D
AT
A-(continued)
,5'R
ips6.
,...,didoa. r,
J..i--rn
0.,..
2c1):64:ecen''
.0;,2R
.,5,,,,,
4
0 ecizZ
EH
Tuning R
ange (Min. C
ap. 30 mm
fd.).0001
.00015.00035
Min.
Max.
Max.
Max.
1k"22
181'
13125
4555
82I,
,,9,
1"18
3053
65100
/P1r
22134
6276
11511'
2739
7085
13511"
2'218
r9
20361
4670
1"131
2851
6296
f,ff
,,1"1r
1822134
6276
11540
7288
13511"
2745
83100
150'ill24
2211"
11+11
19231
3511"
16;14
2530
42,,
,,1"
22116
2936
551,
7,11
11."28
18134
4163
cs1
SH
OR
T-W
AV
E C
OIL D
AT
A-(continued)
tard,,(h)
,s,A
4:Es.
iT
uning Range
(Min. C
ap. 30 =A
l.)ca
4g(6
.:§.',.,...
E4 §,§'u'i
gAg.a.
g'...
'''E'
Min.
Max.
*D02a5.
.1=c5.
1"24
22111"
33121
3846
724"'
'',724221
1"11
1527
3350
7/',,
7,1"
1620
3645
68>
77,
,,1"
22123
4352
80,,
,,,,
1k"28
2750
6092
'i,24
,,22111"1"
331111.
3056
68105
16131
3756
,,,,
,,1"
16;22.1
4151
76,,
, ,71
1"221
2749
6090
,,,,
,P1r
2831
5567
10011'
33135
6478
1201"
24221
1"111
17133
4165
,,,,
1"16;
2546
5686
CO
RADIO ENGINEER'S POCKET BOOK
Diam. ofFormer
4 3 3 3 t4.4 3 3 3 t43 4ENo.
S.W.G.
3 3 3 3 23 3 3 4 [t:
Turns perInch SpacedH approx. OneDiam. of
S.W.G.
LVN11°'
C.An b.D t\DCAD GC b.D Cr, coCZ t..0 No'
4,1- 4,4 Or- tZi".No. ofTurns
Cn 4=. W No 4, 4, OCst\O O.DCZ G.D Cn oo c14, 4=a- csDto- to- to -
O
0 - cc --I CZ 4, 00 CZ C..rt 4, -1 CZ C..ncd,.7 cx) (X) (X) C.n C.)1 1-, O co rP
b*,
to co -a oo cs) ooCn 0 4, Oo -.I CA 0 Co 0
c.C:> -i 4. b.., 00 40. t.C 7 CAD I-, 0tD C.:( 0 CC C.n Cr C.21 CZ CA Cn
H
paMs
Naa
N
RADIO ENGINEER'S POCKET BOOK
TRANSFORMER DATADwrAirs OF STALLOY CORE STAMPINGS.
4
4
Dimensions. ,..,
. Z,' ,'
... E+
,__.,c to'
.
6. ,3
.,-'''
i .-';t it..., r ;
g 0E-,.?..
- taei i'i,.. gt ,4,1 ,
A B C
45
28293031323335
in.
15/161
11.2
15/1611
111i
in.
25/1611-
341li312121.31
in.
ii
1+lgI
1
1
11i
doz.prs.
666
6
666
6
6
5030
250300
45100
75]25200
812
6488865
sq. in.
1ii
35}
I21-,
112151
This table covers most of the commoner sizes of stampings,but some makers give different numbers to stampings ofsimilar size.
UREKA RESISTANCE WIRE
sjv .G. Diameterin inches.
Turns perin. D.S.C.
Lengthper ohm
in inches.Ohms per
yard.
Wt. per1,000
yards inlb.
161820222426283032343638
.064
.048
.036
.028
.022
.018
.014
.012
.010
.009
.007
.006
14.719.625.632.240.048.857.867.175.285.590.1
118.0
173.896.854.432.920.313.79.26.54.93.62.41.5
0.210.370.661.101.772.643.915.577.35
10.1214.8423.80
37.2020.9311.777.1204.3922.9421.9891.3991.0590.76880.52490.3272
45
RADIO ENGINEER'S POCKET BOOK
MAINS TRANSFORMER DATABy means of a Constant obtained from the table
below the turns of wire for a primary of a trans-former may easily be ascertained. For example,the constant of a transformer for a supply of 220volts 50 cycles is 1,760. Therefore, with a core of1 sq.in. cross sectional area you use 1,760 turns ofwire for primary. For a core of 2 sq. in. you use1 760 turns and so on. The secondary is
2directionally proportional to the voltage ratio.
ReactiveVoltage
Frequency cycles per second20 30 40 50 60 70 80 90 100
50 525 485 444 400 362 325 287 250 206100 1050 975 888 800 725 650 575 500 412110 1155 1073 976 880 797 715 632 550 453150 1575 1455 1332 1200 1086 975 861 750 618200 2100 1950 1775 1600 1450 1300 1150 1000 825210 2205 2048 1864 1680 1533 1365 1207 1050 866220 2310 2146 1952 1760 1594 1430 1264 1100 906230 2415 2243 2041 1840 1666 1495 1321 1150 947240 2520 2341 2130 1920 1739 1560 1378 1200 988250 2625 2425 2220 2000 1810 1626 1435 1250 1039
CRYSTAL DATACrystals and their Symbols
Bornite 3Cu2S3Fe2S3Carborunduni SiCCassiterite (tinstone) SnO2Copper pyrites Cu2S2FeS2Galena PbSGraphiteHertzite PbSIron Pyrites FeS2Malachite CuCo2CuH20Molybd.enite MoS2Silicon SiTellurium TeZincite ZnO
Crystal CombinationsCarborundum with Steel Tellurium with ZinciteIron pyrites with Silicon Carborundum with SiliconGalena with Tellurium Copper Pyrites with
Tellurium
46
RADIO ENGINEER'S POCKET BOOK
9
`4
pa
N.co
a
O
O
W
C. 71 , A .., CJ to . +0 0 0 0., 0 CA 0 C.11 IP. Cm C44, .
05 ;
1-, . C. t. 444 CO
t. CO 0 0 c., 0 -0 "0 "0 0 0CA000000000000000000000 cc
1-1 C. t. C. 444 CD
[4., ., 0 G.,, .-, 0 0, C Cr 0 0000000000000000 0000000 C
C .1 1,0 I. c1", 0 ,01. GO 01 In 0 0 0 0 0 0 0 00100000000000000000000000 1"-'°
.C7, 0 0,000000000000000000000000
. . 1-, I. CT, 01 -44 0 00 0 0 0 0 0 0 0 0 CD
C
.C.710-00"1.1-00000-0000000000000000000,00000001-, 1-, 1-,
1-.1-,C.[4.., t, -.I 0 0 Gr, 0
L'
..1-11,[000.0000,0000.00000000000000000000000000COCACOCACDO.1-, t.,[,..
It
0.00000000000000000000000c000000CO C. tD C.,,
t-, 1-, . tO C.'tC..7, 0 CO .441 C, 0b O C a, O O S'
.-, ,--,000,000000.000C.C....C..0....0.....0..to t...., b., CA -41,-, ,- ta c.4 a,[4, CT 0 0 0
g
3 watt 2 watt 1 watt
en
A
Fr
'1
O 0
E.O -
C.
0
CCQ
0
CYQ
47
00cow F-
cez
Resistance V
alues for Decoupling and V
oltage Dropping
VO
LT
AG
E D
RO
PPED
(Cont.)
Currentm
A70
8090
100125
150175
200
170,000
80,00090,000
100,000125,000
150,000175,000
200,0002
35,00040,000
45,00050,000
62,50075,000
87,500100,000
325,000
30,00030,000
30,00040,000
50,00050,000
75,0001 w
att
417,500
20,00025,000
25,00030,0001
40,00040,000
00,0005
15,00017,500
20,00020,000
25,00030,000
40,00040,000
107,000
9,0009,000
I10,000
/ 12,000I
15,00017,500
I20,000
2 watt
155,000
5,0006,000
7,0009,000
I10,000
12,000I
15,0003 w
att20
5,0005,000
5,0005,000
7,0009,000
9,00010,000
4 watt
252,500
2,5001
5,0005,000
5,0001
5,000 /7,000
8,0005 w
att30
2,500I
2,5001
2,5005,000
5,000/
5,000 /7,0001
7,0006 w
att
402,000
2,00012,500
2,500/
2,500/
5,000 /5,0001
5,0008 w
att50
1,500 r-- 1,500 12,000
12,000
/2.500
2,500 /2,500 1
5,00010 w
att4 w
att5 w
att7 w
att8 w
att9 w
att10 w
attT
he values given above are correct to the nearest standard value.
404U
0 gO
.....,,'
,t1 -,8.,
.,.''s S. C
.,g
1.
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a,
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pr.,
RADIO ENGINEER'S POCKET BOOK
ACCUMULATOR PASTES.-The follow-ing -ingredients are required : 4 parts byweight redlead (Pb304), i part by weightlitharge (PbO), 1 part by weight sulphuricacid (T.142 specific gravity). Add the acidgradually to the mixture of redlead andlitharge, stirring well until a fairly stiffpaste has been formed. Thorough mixingis essential, and care must be taken not tomake the paste too thin.
How to Apply. Place the grid on a flatboard and use a scoop to place the pastein the grid. A wooden spreader shouldthen be used to force the paste into thepockets of the grid. A piece of newspaperis then placed on top of the plate, andanother flat board on top of that. Thisenables the plate to be turned over so thatit can be pasted on the opposite side.
Drying. Stack the plates carefully in awarm room to dry. After three or fourdays dip the plates in sulphuric acid (1.25specific gravity) and re -dry.
Paste for Negative Plates. Use thefollowing ingredients : 5 parts by weightlitharge, 1 part by weight of I.xo specificgravity sulphuric acid. Mix, apply, anddry as for positive plates.
For a high -rate discharge cell, the pastefor the negative plates can be varied asbelow :
Litharge, 99.96 per cent. ; lamp -black,.03 per cent. ; 'wood flour, .or per cent.One -sixth of the total weight of the aboveof 1.10 specific gravity sulphuric acid.
Use acid of 1.12 specific gravity, chargeat the rate of about .02 amp. per squareinch of the plate area, counting both sidesof the plate.
50
RADIO ENGINEER'S POCKET BOOK
Neutralising Spilled Electrolyte. Ifelectrolyte is spilled, it should be imme-diately treated with a neuttalising solution,such as sodium carbonate (soda) and water,or ammonia and water. Either of theseliquids is excellent for checking the effectsof acid on clothing. Benches, trays, andother fittings which have become acid -soddenshould be treated with a solution of 'lb.of soda to 1 gallon of water, and then driedbefore coating with acid -proof paint.
JELLY ELECTROLYTE.-Jelly elec-trolyte consists of sulphuric acid to whicha given proportion of sodium silicate hasbeen added. Jellification takes place atvarying speeds according to the proportionsin which the two chemicals are mixed. Asuitable mixture which jellifies in five orsix minutes is-I part of pure sodium silicate(1.2oo specific gravity) to 3 parts of coldsulphuric acid (1.400 specific gravity).
As jellification takes place fairly rapidlyit is essential to arrange that the entireoperation may be carried through withoutany hitch or delay. The cell to be filledwith jelly acid should be given a firstcharge, using ordinary free sulphuric acid.This acid should then be poured off, andthe cell inverted and allowed to drain forabout half an hour.
51
00Ucc"Z'
00
H.T
. ME
TA
L RE
CT
IFIE
RS
StyleR
atedSm
oothedO
utputM
ax.C
urrent
mA
INPU
TO
pen Circuit V
oltageC
apacityof eachV
oltageD
oublerC
ondenser
Working
Voltage
of eachC
ondenserH
alf Wave
Voltage D
blr.V
oltsm
AV
oltsm
AV
oltsm
A
H.T
.14130
120
152030
13530
8060
46200
H.T
.15200
3040
25080
140120
4200
H.T
.16300
6060
40090
240200
4400
H.T
.17200
100150
250150
150300
8250
H.T
.17used forC
lass B150
25-
15040
--
Reservoir
Condenser8 m
fd350
Tw
oH
T.17
used inSeries
500120
150-
-300
5506
500
of
H.F
. ME
TA
L RE
CT
IFIE
RS
Model
Type
Length
Max. Safe
Input Voltage
Max.
Current
Output
Colour ofL
abelW
.4H
alf -wave
1 15/16 in.24-v. peak carrier
0.25 mA
.Y
ellowW
.6H
alf -wave
1 15/16 in.36-v. peak carrier
0.28 mA
.B
lueW
X.6
Half -w
ave...
1 15/16 in.36-v. peak carrier
0.12 mA
.W
hite -Blue
WM
.24Full -w
ave ,centre tap3 in.
24-v. each side ofcentre tap.
0.5 mA
.Y
ellow
WM
.26Full-w
ave,centre tap3 in,
36-v. each side ofcentre tap.
0.5 mA
.B
lue
Formulas R
elative to Circles
To find C
ircumference of a C
ircle :M
ultiply diameter by 3.1416 ; or
Divide diam
eter by 0.3183.
To find D
iameter of a C
ircle :M
ultiply circumference by 0.3183 ;
orD
ivide circumference by 3.1416.
To find R
adius of a Circle :
Multiply circum
ference by 0.15915 ;or
Divide circum
ference by 6.28318.
To find the A
rea of a Circle :
Multiply circum
ference by one -quarter ofthe diam
eter ;or
Multiply
thesquare
ofdiam
eterby
0.7854 ; or
Multiply the square, of circum
ference by0.07958 ;
or
Multiply
the square ofdiam
eter by3.1410.
RADIO ENGINEER'S POCKET BOOK
0
0-3
cD
;-3
t-.
0.
5
C
O
O
zn
C
CD
C
O
O.
;,'t'''
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ti;-3Co
t. t''i-3 ..-3
IQ C.
t';-34.
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ed0 ,.!
,"?,'s
'6' (°g* VCR V
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LAWNY .... cm- 1 I 1 oo co cats.,.
VI
0 .',, a,--.'.8 ; so-,
&,
Aop ?, %
t316 -`05 v.'_, 5>aq:s 6
CO .... CO CoC.,,
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al .,,,
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,-, ;.6
,...
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.
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r-1 F--.
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r
54
RADIO ENGINEER'S POCKET BOOK
DIELECTRIC CONSTANTS.-Thefollowing table gives the specific induc-tive capacities of various materials.These figures represent the dielectricconstants.
Material. S.1.0 .
Air . . . . 1Paper . 1.5Paraffin Wax . . 2.5Ebonite . . . 2.75Shellac . . 3Presspahn . . . 3Flipt Glass . . . 4 to 6Plate Glass . . . 4.5Mica . . . . 5 to 8
DIELECTRIC STRENGTHS.
Material. Dielectric Strengthper Mm.
Glass . . . 8,000Shellac . . 10,000Presspahn . . 6,000 to 15,000Porcelain . . 16,300Rubber . . 18,000Mica . . . 17,009 to 28,000Ebonite . . 30,000Micanite . . 40,000
55
00U0Li/
zzw w3
SPEC
IFIC R
ESIST
AN
CE
OF V
AR
IOU
S MA
TE
RIA
LS.
SUB
STA
NC
ESPE
CIFIC
RE
SISTA
NC
ESU
BST
AN
CE
SPEC
IFICR
ESIST
AN
CE
Advance
.19.2
10-6K
rupp Metal
33.4 x 10-6A
rgentan11.2 x 10-6
Lead
..
7.8 x 10-6C
alido.
.39.3 x 10-6
Manganin
16.5 x 10-6C
limax
..
34.7 x 10-6M
onel Metal
16.1 x 10-6C
on stantan19.3
x 10-6N
ichrome I
38.8 x 10-6C
opper.
.0.63 x 10-6
Nichrom
e II42.6 x 10-6
Eureka .
.18.5 x 10-6
Nickel
..
3.9 x 10-6E
xcello ..
36.0 x 10-6Platinoid.
..
18.4 x 10-6Ferro -N
ickel.
.11.1 x 10-6
Resista .
.29.9 x 0-6
Germ
an Silver ..
13.0 x 10-6R
heostan17.5 x 10-6
Ideal.
..
.19.3 x 10-6
Rheostine
29.9 x 10-6Pure Iron
3.48 x 10-6R
ose's Metal
25.4 x 10-6Soft Steel
4.6 x 10-6Superior
34.3 x 10-6H
ard Steel.
.17.9 x 10-6
Therlo
..
18.4 x 10-6Soft C
ast iron. .29.3 x 10-6
Wood's M
etal22.2 x 10-6
Hard C
ast Iron38.9 x 10-6
Zinc
2.1 x 10-6
tr,
WE
IGH
T O
F SHE
ET
EB
ON
ITE
.T
hicknessW
eight ofA
rea (sq. in.)A
rea (sq. in.)(inch)
1 sq. ft. (oz.)of 1 lb.
of 1 oz.it
13176
1120
117171
268S
5139
5631
5244
2tA
PPRO
XIM
AT
EW
EIG
HT
OF
Lb.
1C
UB
IC IN
CH
OF M
ET
AL
SL
b.Platinum
..
0.78N
ickel.
..
.0.31
Gold
..
..
0.69W
rought Iron.
.0.28
Mercury
..
0.49Steel
0.28L
ead.
..
.0.41
Cast Iron
..
0.26Silver
.0.36
Tin
..
..
0.26B
ismuth
..
0.35Z
inc.
..
.0.26
Copper
..
0.32A
ntimony
..
0.24B
rass.
.0.31
Alum
inium.
.0.097
Magnesium
0.063D
uralumin
0.101
RADIO ENGINEER'S POCKET BOOK
SCREWS:BRITISH ASSOCIATION (B.A.)
Absolute Approxi- ApproximateDimensions in mete Dimensions in
Millimetres Number InchesNo. Full of Full
Die-meter
Pitch Threadsper Inch
Dia-meter
Pitch
25 0.25 0.070 362.8 0.010 0.002824 0.29 0.080 317.5 0.011 0.003123 0.33 0.09 282.2 0.013 0.003522 0.37 0.10 254.0 0.015 0.003921 0.42 0.11 230.9 0.017 0.004320 0.48 0.12 211.6 0.019 0.004719 0.54 0.14 181.4 0.021 0.005518 0.62 0.15 169.3 0.024 0.005917 0.70 0.17 149.4 0.028 0.006716 0.79 0.19 133.7 0.031 0.007515 0.90 0.21 121.0 0.035 0.008314 1.0 0.23 110.4 0.039 0.009113 1.2 0.25 101.6 0.047 0.009812 1.3 0.28 90.7 0.051 0.011011 1.5 0.31 81.9 0.059 0.012210 1.7 0.35 72.6 0.067 0.0138
9 1.9 0.39 65.1 0.075 0.01548 2.2 0.43 59.1 0.087 0.01697 2.5 0.48 52.9 0.098 0.01896 2.8 0.53 47.9 0.110 0.02095 3.2 0.59 43.0 0.126 0.02324 3.6 0.66 38.5 0.142 0.02603 4.1 0.73 34.8 0.161 0.02872 4.7 0.81 31.4 0.185 0.03191 5.3 0.00 28.2 0.209 0.03540 6.0 1.00 25.4 0.236 0.0394
It is recommended that for screws lessthan }-in. diameter British AssociationThreads -should be adopted. It was originallyproposed by the British Association in 1884, andfinally adopted by them in 1904. It is, however,not yet the usual practice in this country to usethe sizes ranging from No. 17 upwards. More-over, makers of taps, dies, screwplates, etc.,usually supply sizes to No. 16.--...
58
RADIO ENGINEER'S POCKET BOOK
',....3- g
':.1.
(2 P
g. .. .
-Y' -Ppt ;,2,
5..5- 5cm cm g-
.
g 8
cc7c- P' :-.-,-:-.c, 5
(51 f::: g*
:..-- : 70 Z.,
amp.4z .g,?,.n n ,-,
'.' %'
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59
RADIQ ENGINEER'S POCKET BOOK
TWIST DRILL GAUGE SIZES
No. Drill. DecimalSizes. No. Drill. Decimal
Sizes.
1 .2280 31 .12002 .2210 32 .11603 .2130 33 .11304 .2090 34 .11105 .2055 35 .11006 .2040 36 .10657 .2010 37 .10408 .1990 38 .10159 .1960 39 .0995
10 .1935 40 .098011 .1910 41 .096012 .1890 42 .093513 .1850 43 .089014 .1820 44 .086015 .1800 45 .082016 .1770 46 .081017 .1730 47 .078518 .1695 48 .076019 .1660 49 .073020 .1610 50 .070021 .1590 51 .067022 .1570 52 .063523 .1540 53 .059524 .1520 54 .055025 .1495 55 .052026 .1470 56 .046527 .1440 57 .043028 .1405 58 .042029 .1360 59 .041030 .1285 60 .0400
LETTER SIZLS OF DRILLS
A .234 H .266 0 .316 U .36SB .238 I .272 P .323 V .377C .242 J .277 Q .332 W .386D .246 K .281 II, .339 X .397E .250 L .290 S .318 Y .401F .257 M .295 T .358 Z .413G .261 N .302
60
RADIO ENGINEER'S POCKET BOOK
WOOD SCREW PROPORTIONSTWIST DRILLS FOR WOOD SCREWS
No. Dia- With Side Lips(or) meter For Wood or Metal. and Centre forsize) of Neck Wood only.
of orScrew. Shank. No., etc. Dia- Size. Dia-
meter. meter.
1 .066 .; - 51 .067 -2 .080 71 46 .081 -3 .094 fL1 41 .096 - -4 .108 a 35 .110 - -5 .122 30 .128 1/8 .12567
.136
.150,1
-,2823
.140
.154-5/32
-.156
8 .164 .,,-.4 18 .169 - -9 .1.78 14 .182 3/18 .187
10 .1.92 i 9 .196 - -11 .206 .0 4 .209 7/32 .21812 .220 . 1 .228 - -13 .234 '11 B .238 - -14 .248 E .250 1/4 .25015 .262 H .266 - -16 .276 = K .281 9/32 .28117 .290 'll_,.. M .295 - -18 .304 A' 0 .316 5/18 .31219 .318 P .323 - -20 .332 11 .339 11/32 .34321 .346 L3 f S
I T .348.358 - -
22 .360 E.> U .368 3/8 .37523 .374 -;-; V .377 3/8 .37524 .388 4 X .397 - -25 .402 Z .413 13/32 .40626 .416 2,/64 .421 -- -27 .430 7/16 .437 7/16 .43728 .444 29/64 .453 - -29 .458 15/32 .468 15/12 .46830 .472 31/64 .484 -- --31 .486 1/2 .500 1/2 .50032 .500 33/64 .515 1/. .500
All dimensions in parts of an inch.
61
RADIO ENGINEER'S POCKET BOOK-...-....,---,-..,STANDARD WOO D SCREWS
No. ofScrewGauge
Dia-meter.
A in Dec.
.,,z2.
,-, ,...121
' `-q---'N,qk-.4
B in-
Depthof C'sink.
Slot.
Wulth Depth.
0 .05784 1/16 7/64 1/32 1/64 1/641 .07100 5/64 9/64 3/64 1/64 1/322 .08416 5/64 11/64 3/64 1/64 1/323 .09732 3/32 3/16 3/64 1/64 1/324 .11048 7/64 7/32 1/16 1/32 1/12
5 .12364 1/8 15/64 1/16 1/32 1/326 .13680 9/64 17/64 5/.64 1/32 3/647 .14996 5/32 19/64 5/64 1/32 3/648 .16312 5/32 21/64 3/32 3/64 3/64
9 .17628 11/64 23/64 3/32 3/64 3/6410 .18944 3/16 2/8 7/64 3/64 1/1611 .20260 13/64 13/32 7/64 3/64 1/1612 .21576 7/32 7/16 1/8 3/64 1/1613 .22892 15/84 29/64 1/8 1/16 1/1614 .24208 1/4 31/64 9/64 1/16 1/1615 .25524 1/4 33/64 9/64 1/16 1/1616 .26840 17/64 /7/32 5/32 1/16 516417 .28156 9/32 9/16 5/32 1/16 5/6418 .29472 19/64 19/32 11/64 5/64 5/6419 .30788 5/16 39/64 11/64 5/64 5/6420 .32104 21/64 41/64 11/64 1/64 2/6421 .33420 21/64 43/64 3/16 5/64 3/3222 .34736
).3605211/32 11/16 3/16 3/32 3/32
23 23/64 23/32 13/64 3/32 3/3224 .37368 3/8 3/4 13/64 3/32 8/32
62
RADIO ENGINEER'S POCKET BOOK
WOOD SCREW PROPORTIONS
COWITEARINX1540 L..A-90°8.20
BALL NE4oT-Bocrs4 Mfrs
41/Lo SrEELOcAss AmsAND HUTS
READ
.54fAUHEAD
L.
ROUNDHEAD L.8-20 RASED CHEESE en.m.,5- .7S0 READ READ READ
WAL,rwoarh, ScREws
- -.ITel 44.4b
8-84'01.,4E+H. -Z40
RA/5E04.30. El./v9D
COUNTERSUNK
_t
CHEESESouARE
8 -/SD 8.7.733o
5
HEXAGON
-0 13 ^A, -1.5o11.0
,TUL L
RouND_t
CHEESE
6. /7.5o 8.17.5e, H.:750
CO"'''""8-i7S0 B. A Scab,*
GALLERY SCREWS HL F3 Ni
fsad.,,RE8./660
VI
H1;"L 84,1.....
H- Bu
1 SCREWS
li!
63
o0
Density
of Solids and
LiquidsA
luminium
2.58 g.per cub cm
.161..1 lb.
per cub. ft.C
opper8.9 g.
7777
555.4 lb.G
old..
19.3 g.77
1205.0' lb.Ice
..0.9167 g.
57.2 lb.Iron
..7.87 g.
of
491.3 lb.L
ead..
11.0 g.77
686.7 lb.M
ercury13.596 g.
848.7 lb.N
ickel8.80 g.
549.4 lb.Platinum
21.50 g.1342.2 lb.
Sea Water
1.025 g.64.0 lb.
Silver10.5 g.
655.5 lb.T
in..
7.18 g.57
448.2 lb.T
ungstenU
ranium18.6
g.
18.7 g.1161.2 lb.1167.4 lb.
7777
Water
1.000 g.62.4 lb.
Zinc
..7.19g.
448.6 lb.
03or
w vi
c.;
...0ki
,XpeAN
tliMt.-WisN01
NC4
M.41C-MNut
'0'0
OMO
,t,ocici.c-,tic:,-in-3c4cokocioo5csicoiriviuitcitzoio,--icdooc\iciui000,-o&
12,2 g le 12 r- 2S) 8 2 241 ZS' a° FL
' 22 3 E`a ,',;' 2 V
i'Zg:? i W
ag? Ea ri 2 fzi 2
« ,.-)-',?.5a82EF,:i's,22F-2g822g.7,28g2g828S82828F,828
. . 0, ..,,,,,,,...*,,,,,,,,,,F. . L. . ....L.... .. ,...-t- cow. 0 N ...-- 0
g,,.......0
0N ,..M.4.MMm.
oot-em000000.ta,0.,pm
.,1,0,,,c,00.0.,(D
cDoc,c,c,c,c4ct,t:,m
ot,..N01,Z
Z'o"M
131)171V42,'"%
3_Icliicioocc,,,,,,,,000c,c,o.d.,tc,,com
o.)0010.1c.,,,,--,,,,,00000ti;z.,562m,..3
ooN r:c...5'O
c\i'Sc,ca,-1,4,-, H",--1.-1,-1,-1,-7,-1,-1,4,4,4,--1,-1,4,4-1',-, cn a>
co oo co ao
..;v.173
oct-opoo.,0000000000uto,>oov5o,,noo.,0000000
HNO0000.,-INNMMeNTNIL,4=e0t-t...WOMO.Nmcroes,
HHOINNNNNOINNNNNONNNNNNMMMV)MOM
RADIO ENGINEER'S POCKET BOOK
STANDARD COLOUR CODES.Resistances and Condensers.
The colour codes for fixed condensers andfixed resistors are identical, the standard forresistors being ohms and for fixed condensersmmfd.
No. ofColour Fig. Noughts.Black .. .. 0 NoneBrown .. 1 0Red .. .. 2 00Orange 3 000Yellow 4 0000Green .. . 5 00000Blue .. 6 000000Violet .. . 7Grey .. 8White .. .. .. .. 9The order of reading these colours is : Body
Tip, Dot.Example : Resistance with red body, black
tip and orange spot will have value of 20,000ohms. If there is no dot on the body it indicatesthat it is of the same colour as the body.
Multiple Condenser Blocks.The highest capacity positive voltage.. RedThe second highest do. .. YellowThe third highest do. GreenThe fourth highest do. .. BlueThe fifth highest do. .. VioletPrincipal negative connection.. .. BlackSecond do. .. BrownThird do. .. .. GreyCentre connection for voltage doubler
condensers .. .. .. .. WhiteWhere only two leads are used, positive is
red and negative black.Fuses.
60 mA. .. Black 1 amp... Dark Blue100 mA. .. Grey 1-/ amp... Light Blue150 mA. .. Red 2 amp... Purple250 mA. .. Brown 3 amp... White500 mA. .. Yellow 5 amp... Black and750 mA .. Green , , White
66
RADIO ENGINEER'S POCKET BOOK
Standard Colour Codes-(continued)Mains Transformer Data
Primary zero . . Blackff 10 volts .. Black & Green
210 . Black & Yellow/7 230 .. Black & Red
250 . . Black & BrownSecondary Rectifier Heater . . Green
!, High Voltage . . RedValve Heaters . . BrownAdditional Valve
Heaters . . BlueCentre -tap leads are marked with the
same colour as the appropriatesecondary winding, but with ayellow line interwoven.
Battery LeadsHighest voltage positive . . RedSecond do . . YellowThird do . . GreenFourth do . . BlueLow-tension positive . . PinkCommon negative
(L.T., H.T., G.B.).. .. BlackMax. G.B. negative . . BrownSecond do . . . GreyThird do .. .. WhiteAny additional point, such as thefourth greatest G.B. negative, or fifthgreatest H.T. positive, or positivebias, is violet, and any centre -tapis white.
67
RADIO ENGINEER'S POCKET BOOK
INTERNATIONALAbbrev. QuestionQRA What is the name of
your station ?QRB How far approxi-
mately are youfrom my station ?
QRD Where are you boundand where are youfrom ?
QRG Will you tell me myexact frequency inkilocycles ?
QRH Doe's my frequencyvary ?
QRI Is my note good ?QRJ Do you receive me
badly ?Are my signals
weak ?QRB Do you receive me
well ?Are my signals
good ?GRL Are you busy ?
QRM Are you being inter-fered with ?
QRN Are you troubled byatmospherics ?
QRO Shall I increasepower ? ...
QRP Shall I decreasepower ?
QRQ Shall I send faster ?
QRS Shall 1 send moreslowly ?
QRTQRU
Shall I stop sending ?Have you anything
forme?
"Q" CODEAnswer for AdviceThe name of my
station is . . .
The approximatedistance is . .
miles
I am bound for . . .
from . . . .
Youf exact fre-quency is . . . kc
Your frequencyvaries.
Your note varies.I cannot receive
you.Your signals are
too weak.I receive you well.
Your signals aregood.
I am busy. Pleasedo not interfere.
I am being inter-fered with.
I am troubled byatmospherics.
Increase power.
Decrease power.Send faster ( .
words per min-ute).
Send more slowly( . . . words perminute).
Stop sending.I have nothing for
you.
68
RADIO ENGINEER'S POCKET BOOK
INTERNATIONALAbbrev. QuestionQRV Are you ready ? ...QRX Shall I wait ? When
will you call meagain ?
QRZ Who is calling me ?
QSA What is the strengthof my signals ? (1to5) ... ...
QSB Does the strength ofmy signals vary ?
Q SD Is my keying correct?Are my signalsdistinct ?
QSL Can you give meacknowledgment ofreceipt ?
QSM Shall I repeat the lasttelegram (message)I sent you ?
QSO Can you communicatewith . .. direct (orthrough the me-dium of . ..) ?
QSP Will you retransmitto...?QSV Shall I send a series
of V's ?QSX Will you listen for ...
(call sign) on .kc ?
QSZ Shall I send each wordor group twice ?
QTII What is your positionin latitude andlongitude ?...
QTR What is the exacttime ?
" Q " CODEAnswer for Advice
I am ready.Wait (or wait until
I have finishedcommunicatingwith . . . ) I willcall you at . .
GMT.You are being
called by . . . .
The strength ofyour signals is .(1 to 5).
The strength ofyour signalsvaries.
Your keying is in-distinct. Yoursignals are bad.
I give you acknow-ledgment of re-ceipt.
Repeat the lasttelegram (mes-sage) you havesent me.
I can communicatewith . . . director through themedium of . . .).
I will retransmitto . .
Send a series ofV's.
I am listening for. . . (call sign) on. . . kc.
Send each word orgroup twice.
My position is . . .
latitude . . .
longitude.The exact time is
69
RADIO ENGINEER'S POCKET BOOK
MISCELLANEOUS INTERNATIONALABBREVIATIONS
Abbrev. Meaning Abbrev. MeaningC ... .. Yes GA .. .. Resume sendingN .. No MN.. .. Minute/minutesW .. .. Word NW .. I resume transmis-.AA .. .. All after ... sionAB .. . All before ... OK.. .. AgreedAL .. .. All that has just UA ... .. Are we agreed 1
been sent WA .. Word after ...BN .. .. All between WB .. Word before ...CL .. .. I am closing my XS .. .. Atmospherics
stationAMATEUR ABBREVIATIONS
Abbrev. Meaning Abbrev. MeaningABT About NM.. .. No moreAGN Again N It . . . . NumberANI Any NW .. NowBA.. . Buffer amplifier OB .. .. Old boyBCL .. Broadcast listener OM.. .. Old ManBD .. .. Bad OT .. .. Old timerIll .. By PA .. .. Power amplifierBK . Break in PSE .. PleaseBN .. Been R .. .. Received all sentCK .. Cheek RAC .. Rectified A.C.CRT Circuit RCD .. ReceivedCLD . Called RX.. .. ReceiverCO .. . Crystal oscillator SA .. .. SayCUD . Could SED .. SaidCUL .. See you later SIGS .. SignalsDX.. . Long distance SIGN .. SignatureECO Electron -coupled SSS .. Single Signal au -
oscillator perheterodyneES .. And receiverFR .. Fine business SKD Schedule
(good work) TKS ThanksFD Frequency doubler MIN To -morrowFM From TNX. ThanksGA Go ahead, or Good TPTG Tuned plate tuned
afternoon gridGB.. Good-bye TX.. TransmitterGE.. . Good evening U .. . YouGM Good morning UR .. You areGN .. Good night VY .. .. VeryHAM .. Radio amateur WDS .. WordsHI .. Laughter WKG .. WorkingHR.... Hear, or here WL.. .. WillHRD . Heard WUD .. WouldHV .. Have WX .. WeatherLTR Later YF.. .. WifeMILS Milliamperes YL.. .. Young ladyMO .. . Meter Oscillator YR.. .. YourND .. Nothing doing 73 .. .. Kind regardsNIL . Nothing 88 .. .. Love and kisses
70
RADIO ENGINEER'S POCKET BOOK
QSA CODE (Signal Strength)QSA1 .. Hardly perceptible ; unreadable.QSA2 .. Weak, readable now and then.QSA3 .. Fairly good; readable, but with difficulty.QSA4 .. Good ; readable.QSA5 .. Very good; perfectly readable.
QRK CODE (Audibility)R1 Unreadable.R2 Weak signals ; barely readable.113 Weak signals ; but can be copied.R4 Fair signals ; easily readable.R5 Moderately strong signals.R6 Good signals.117 . Good strong signals.R8 . Very strong signals.R9 Extremely strong signals.
RST CODE (Readability)1 Unreadable.2 Barely readable, occasional words dis-
tinguishable.3 Readable with considerable difficulty.
Readable with practically no difficulty.Perfectly readable.
(Signal Strength)1 Faint, signals barely perceptible.
. Very weak signals.Weak signals.
4 . Fair signals.5 Fairly good signals.
. Good signals.7 Moderately strong signals.8 Strong signals.9 Extremely strong signals.
(Tone)1 Extremely rough hissing note.2 . Very rough A.C. note, no trace of musicality.3 Rough, low-pitched A.C. note, slightly musical.4 Rather rough A.C. note, moderately musical.5 . Musically modulated note.6 Modulated note, slight trace of whistle.7 . Near D.C. note, smooth ripple.8 Good D.C. note, just a trace of ripple.9 .. Purest D.C. note.(If the note appears to be crystal -controlled add an
X after the appropriate number).71
RADIO ENGINEER'S POCKET BOOK
AC4ARCECMCN1CNBCOCPCR4CR5CR6CR7CRSCR9CR10CT1CT2CT3CXDEAEA6EA8EA9EIELEPEQESET
FFAFBFDFEFFFGFIFKFLFMFNFOFP
Fee
FRFT
INTERNATIONAL MORSE CODE.A dit dahB dah dit dit ditC dah dit dah ditD dah dit ditE ditF dit dit dah ditG dah dah ditH dit dit dit ditI dit ditJ dit dah dah dahK dah dit dahL dit dah dit ditM dah dahN dah ditO dah dah dabP dit dah dah ditQ dah dah dit dabR dit dah ditS dit dit ditT dahU dit dit dah
dit dit dit dahW dit dah dahX dah dit dit dahY dah dit dah dahZ dah dah dit ditNumber Code1 dit dah dah dah dah2 dit dit dah dah dah3 dit dit dit dah dah4 dit dit dit dit dah5 dit dit dit dit dit6 dah dit dit dit dit7 dah dah dit dit dit8 dah dah dah dit dit9 dah dah dah dah ditO dah dah dah dah dahNote of inter-
rogation dit dit dah dah dot ditNote of ex-
clamation dah dah dit dit dah dahApostrophe dit dah dah dah dah ditHyphen dah dit dit dit dit dahFractional bar dah dit dit dah ditBrackets dah dit dah dah dit dabInverted com-
masUnderlinePrelim. callBreak signEnd messageError
dit dah dit dit dah ditdit dit dah dah dit dabdah dit dab dit dahdah dit dit dit dahdit dah dit dah ditdit dit dit dit dit dit dit dit
72
RADIO ENGINEER'S POCKET BOOK
INTERNATIONAL AMATEURCALL -SIGNS
FUTibetSyriaChileCubaTangier ZoneMoroccoCuba (fone)BoliviaCape Verde IslandsPortuguese GuineaAngolaMozambiquePortuguese IndiaMacaoTimorPortugalAzoresMadeira IslandUruguayGermanySpainBalearic IslandsCanary IslandsSpanish MoroccoIrish Free StateLiberiaIran (Persia)Iran (Persia)EstoniaEthiopia (Abys-
sinia)FranceAlgeriaMadagascarFrench TogolandFrench CameroonsFrench West AfricaGuadeloupeFrench Indo-ChinaNew CaledoniaFrench SomalilandMartiniqueFrench IndiaFrench OceaniaSt. Pierre and
MiquelonFrench Equatorial
AfricaReunion IslandTunisia
FY
G
GIHAHBHCHEHI
HKHP
HRHSHZ
J8J9K4K5K6K6K6K6
French NewHebrides
Guyane (FrenchGuiana)
British Isles(G -England ; GM -Scotland ; GW-Wales)North IrelandHungarySwitzerlandEcuadorHaitiDominican Re-publicColombiaRepublic of
PanamaHondurasSiamHedjazItalyJapanChosen (Korea)FormosaVirgin IslandsCanal ZoneHawaiiGuamSamoaMidway and Wake
IslandsK7 AlaskaKA PhilippinesLA NorwayLU ArgentinaLX LuxembourgLY LithuaniaLZ BulgariaMX ManchukuoNY Canal ZoneOA PeruOE AustriaOH FinlandOK CzechoslovakiaOM GuamON Belgium0Q5 Belgian CongoOX GreenlandOY Faroe IslandsOZ Denmark
73=.111:111Mi.
RADIO ENGINEER'S POCKET BOOK
PAPJPKPXPYPESMSPSTSUSVSV6TATF
INTERNATIONAL AMATEURCALL -SIGNS
NetherlandsCuracaoDutch East IndiesAndorraBrazilSurinamSwedenPolandSudanEgyptGreeceCreteTurkeyIceland
TG GuatemalaTI Costa RicaU, UR, IK U.S.S.R.VE CanadaV K AustraliaVO Newfoundland
LabradorVP1 British HondurasVP4 Leeward Is. and
Windward Is.VP3 British GuianaVP4 Trinidad and TobagoVP5 Jamaica, Cayman Is.,
Turks and Caicos Is.VP6 BarbadosVP7 BahamasVP8 Falkland Is., South
Georgia Is.VP9 BermudaVQ1 ZanzibarVQ2 Northern RhodesiaVQ3 TanganyikaVQ4 KenyaVQ5 UgandaVQ6 British SomalilandVQ8 MauritiusVQ9 SeychellesVR1 Gilbert and Ellice Is.VR2 FijiVR3 Fanning Is.VR4 British Solomon Is.VR5 TongaVR6 PitcairnVS1 Straits SettlementsVS2 Fed. Malay States
VS3 Non -Fed. Malay StatesVS4 Sarawak North BorneoVS5 Labuan, BruneiVS6 .,Hong KongVS7 CeylonVS8 BahreinVS9 Maldive Is.VU British IndiaVU4 Laccadive Is.W, WA United States of
AmericaXE MexicoXU ChinaXZ BurmaYA AfghanistanYI IraqYL LatviaYM DanzigYN NicaraguaYR RumaniaYS Salvador'VT, YU Jugo-SlaviaY V VenezuelaZA AlbaniaZ131 MaltaZB2 GibraltarZC1 TransjordaniaZC2 Cocos Is.ZC3 Christmas Is.ZC4 CyprusZC6 PalestineZDI Sierra LeoneZD2 Nigeria, BritishZD3 GambiaZD4 Gold Coast, British
TogolandZD6 NyasalandZD7 St. Helena.ZD8 Ascension Is.ZD9 Tristan da CunhaZ1,11 Southern RhodesiaZKI Cook Is.ZK2 NiueZL New ZealandZIA Western SamoaZP ParaguayZS Union of S. AfricaZS3 South West Africa
74
RADIO ENGINEER'S POCKET BOOK
PHONETIC ALPHABETTo avoid the possibility of the letters
of a call -sign being misunderstood, itis usual to use the words given belowin place of the letters. For example,G6PY would be given as G6 ParisYokohama.
Letters to bespeltA
CDEFGHI
JKL
N
B
Q
STU
P
XYZ
Words to be used forspelling
AmsterdamBaltimoreCasablancaDenmarkEdisonFloridaGallipoliHavanaItalyJerusalemKilogram (or Kilowatt)LiverpoolMadagascarNew YorkOsloParisQuebecRomaSantiagoTripoliUpsalaValenciaWashingtonXanthippeYokohamaZurich
75
-
RADIO ENGINEER'S POCKET BOOK
AMATEUR WAVEBANDS (BRITISH)Five -metre Band - 56,020-59,980 kc/s.Ten -metre Band - 28,010-29,990 kc/s.
Twenty -metre BandMetres Kilocycles Metres Kilocycles20.921.021.1
14,35314,28514,218
Forty -metre
21.221.321.4Band
14,15114,08514,019
Metres Kilocycles Metres Kilocycles41.241.341.441.541.641.741.841.942.0
7,281.57,263.87,246.37,228.87,211.57,194.27,177.07,159.97,142.8
Eighty -metre
42.142.242.342.442.542.642.742.8
Band
7,125.97,109.07,092.2 ,
7,075.47,058.87,042.27,025.77,009.3
Metres Kilocycles Metres Kilocycles Metres Kilocycles80.580.680.780.880.981.081.181.281.381.481.581.681.781.881.982.082.1
Note.the 5-bandfractions.
3,726.63,722.03,717.43,712.83,708.23,703.63,699.13,694.53,690.03,685.53,681.03,676.53,672.03,667.53,663.03,658.53,654.2
-Wavelengthsand 10 -metre
width, which
82.282.382.482.582.682.782.882.983.083.183.283.383.483.583.683.783.8
inbands,
would,-
3,649.73,645.23,640.73,636.33,631.93,627.53,623.13,618.23,614.33,610.03,605.73,601.43,597.13,592.83,588.53,584.23,579.9Metres are
owingresult in awkward
83.984.084.184.284.384,484.584.684.7p4.884.985.0 '3,529.385.185.285.385.485.5not given
to the
3,575.63,571.33,567.13,562.93,558.73,554.53,550.33,546.13,541.93,537.73,533.5
3;5252 3,521.03,516.93,512.83,508.7
fornarrowdecimal
76
RADIO ENGINEER'S POCKET BOOK
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RADIO ENGINEER'S POCKET BOOK
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RADIO ENGINEER'S POCKET BOOK--C.)
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81
RADIO ENGINEER'S POCKET BOOK
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82
RADIO ENGINEER'S POCKET BOOK
DECIBEL.-The comparative unit of soundstrength. The value chosen for 1 decibel is thesound which can just be discerned by the trainedear.
RELATIONSHIP BETWEENDECIBELS AND POWER RATIO
Decibels. PowerRatio. Decibels. Power Ratio.
1 1.25 - 1 1.26 = '8
2 1.6 - 2 r1, = .6253 2.0 - 3 I. =.54 2.5 - 4 F..7) =.45 3.2 --5 ,--... =.3125
26 4.0 - 6 1 = .257 5.0 - 7 * =.2
6.0 - 8 -/r = .1669 8.0 - 9 i = .125
110 10.0 -10 fo =.120 100.0 -20 1 = .01
10 0
30 1000.0 -30 it--T-ro = .001
THE GREEK ALPHABET.-The Greek alphabetis as follows :A a (alpha), B A (beta), P y (gamma), .1 8 (delta),E E (epsilon), Z 4" (zeta), H ri (Eta), e 0 (theta),I c (iota), K K (kappa), A A (lambda), M ja. (mu),N v (nu), B $ (xi), 0 o (Omicron), 11 7, (pi),P p (rho), .7. a- g (sigma), T T (tau), Y I, (upsilon),st, 4, (phi), X x (chi), sl, 4, (psi), 0, ca (.,mega).
83
L - r
1
RADIO ENGINEER'S POCKET BOOK
MUSICAL NOTES FREQUENCY.-The frequency of the notes of thepianoforte covers the band from 26 .to4,096 vibrations per sebond. The lowestnote, A, has a frequency of 26, middle C(the centre note of the standard pianokeyboard) a frequency of 256, and thetop note of the standard piano has afrequency of 4,096.shows the pianofrequencies :
The following tablenotes and their
A 26 G 96 F 341 E 1,280B 30- A 106 G 384 F 1,365C 32 B 120 A 426 G 1,536D 36 C 128 B 480 A 1,706E 40 D 144 C 512 B 1,920F 42 E 160 D 576 C 2,048G 48 F 170 E 640 D 2,304A 53 G 192 F 682 E 2,560B 60 A 213 G 768 F 2,730C 64 B 240 A 853 G 3,072D 72 C 256 B 960 A 3,413E 80 'D 288 C 1,024 B 3,840F 85 E 320 D 1,152 C 4,096
84
RADIO ENGINEER'S POCKET BOOK
HORSE -POWERThe unit of work (Horse power) is based on the
assumption that a horse can travel 21 miles per hourfor 8 hours a day, performing the equivalent of pullinga load of 1501b. out of a shaft by means of a rope.Thus 2i. miles an hour is 220ft. per minute, and atthat speed the load of itelb. is raised vertically thesame distance. Therefore, 300/b. would be raised110ft. or 3,000/b. raised lift., or 33,000/b. raised lft.high per minute. The latter is the unit of horse-power, i.e., 33,0001b. raised lft. high per minute, or33,000 foot -lb. per minute. Electrical equivalent is746 watts.
Horse Power of an Electric MotorVolts x Amperes
T.H.P. - 746Horse Power (Indicated) of a Steam Engine (Single -
acting)PLANI.H.P. - 33,000
where P=Mean effective steam pressure in lb. persq. in.
L = Length of stroke in feet.A = Area of piston in sq. in.N = Number of revolutions per minute.
For a double-acting engine the formula is :2PLAN
I.H.P. - 33,000
Horse Power of Petrol EnginesD2N
R.A.C. Formula : H.P. = 16.13
Dendy Marshal Formula : H.P. -Where S=Stroke in centimetres.
D=Diameter of cylinder in centimetres.R=Revolutions per minute.N=Number of cylinders.
A.C.U. Formula : 100 c.c. = 1 h.p.
D28NR200,000
85
-_
CH
OR
DS
OF
CIR
CL
ES
No. of
Multiply
No. of
Multiply
No. of
Multiply
No. of
Multiply
No. of
Multiply
Spaces.D
ie. bySpaces
Dia. by
SpacesD
ia. bySpaces
Dia. by
Spaces' Dia. by
3.8660
23.1362
43.0730
63.0499
83.0378
4.7071
24.1305
44.0713
64.0491
84.0374
5.5878
25.1253
45.0698
65.0483
85.0370
6.5000
26.1205
46.0682
66.0476
86.0365
7.4339
27.1161
47.0668
67.0469
87.0361
828
.112048
.065468
.046288
.03579
..3827.3420
29.1081
49.0641
69.0455
89.0353
10.3090
30.1045
50.0628
70.0449
90.0349
11.2817
31.1012
51.0616
71.0442
91.0345
12.2588
32.0980
52.0604
72.0436
92.0341
13.2393
33.0951
53.0592
73.0430
93.0338
14.2225
34.0923
54.0581
74.0424
94.0334
15.2079
35.0896
55.0571
75.0419
95.0331
16.1951
36.0872
56.0561
76.0413
96.0327
17.1838
37.0848
57.0551
77.040S
97.0324
18.1736
38.0826
58.0541
78.0403
98.0321
19.1646
39.0805
59.0532
79.0398
99.0317
20.1564
40.0785
60.0523
80.0393
100.0314
21.1490
41.0765
61.0515
81.0388
22.1423
42.0747
62.0507
82.0183
ME
TA
LLIC E
LEM
EN
TS
AN
DT
HE
IRP
RO
PE
RT
IES
Num
ber of Symbol.
Colour.
Date.
Ato-
Weight
SpecificG
ravityor
Density.
SpecificN
eat.
Melting-point
(° Centi-
grade.)
Coefficient
of Linear
Expan-sion.
Alum
inium ... A
lT
in -white
182727.1
2.67.2140
657.0000231
Antim
ony... Sb
Bluish -w
hite-
120.26.71-6.86
.0508630
.0000105A
rsenic... A
sSteel -grey
75.05.72
.081450
.0000055B
arium... B
aPinkish -grey
1808137.4
3.8.068
850-
Beryllium(see G
lucinwn)
Bism
uth... B
iPinkish -w
hite-
208.09.823
.0305268
.000014B
romine
... Br
79.6C
admium
... Cd
Tin -w
hite1817
112.48.546-8.667
.05483-22
.000027C
easium.:. C
sSilver -w
hite18 ,0
132.81.9
.04827
-C
alcium... C
aY
ellow1807
40.11.573
.1700800
.0000269C
erium... C
eG
rey1819
140.27.64
.0448623
-C
hromium
... Cr
Grey
179752.0
6.81-7.3.1200
1.700C
obalt... C
oG
reyish -white
174259.0
8.5-8.7.1070
1,490.00-00123
Colum
biumC
b(see N
iobium)
Copper
... Cu
Red
-63.6
8.92-8.95.0952
1.100.0000167
Erbium
... E-
1843166.0
--
--
Gadolinium
... Gd
D. 86
156.0-30
-G
allium... C
aB
luish -white
187569.9
5.9.079
Germ
anium ... G
eB
luish -white
188572.5
5.5.074
900.0000167
Glucinum
... GI
Silver -white
12289.1
1.9.5820
Gold
...... A
uY
ellow197.2
19.265.0324
1,065.00-00136
Indium... In
White
1863114.8
7.42.0570
176.0000417
se00w2_zz rr
ME
TA
LLIC E
LEM
EN
TS
AN
D T
HE
IR P
RO
PE
RT
IES
(continued)'
Ato-
SpecificG
ravitySpecific
Melting-point
Coefficient
of Linear
Num
ber of Symbol.
Colour.
Date.
mic
orD
ensity.D
ensity.H
eat.(oC
enti-grade.)
Expan-sion..
Iridium...
IrSteel -w
hite1803
193.122.38
.03262,250
.0000065Iron
...... Fe
Silver -white
-55.9
7.84.1140
1,550.0000116
Lanthanum
... La
Grey
1839139.0
6.163.0449
826-
Lead
...... Pb
Bluish -w
hite-
207.111.254-11.388
.0314328
.000027L
ithium... L
iSilver -w
hite1818
7.02.589-.598
.9410180
-M
agnesium ... M
gSilver -w
hite1808
24.31.75
.2500632
.0000269M
anganese ... Mn
Reddish -grey
-55.0
8.0.1220
1,245-
Mercury
... Hg
Bluish -w
hite300
s.c.200.0
13.594.0319
--_40.0000610
Molybdenum
Mo
Neodym
iumSd
Silver -white
-1782-
96.0143.6
8.67.0
.0722-
2,450840
--N
ickel... N
iN
iobium... N
bSteel -grey
17541846
58.793.5
8.912.1
.1080.071
1,4501,950
.0000127-
Osm
ium... O
sB
luish -white
-190.9
22.5.0311
2,500.0000065
Palladium... Pd
Tin -w
hite1804
106.711.4
.05931,549
.0000117Platinum
... Pt-
1558195.2
21.5.0324
17780.0000089
Potassium... K
Silver -white
180739.10
.875.1660
60.0000841
Praseodymium
Pr-
-140.5
6.5-
940-
Radium
... Ra
-1901
225.0-
-.-
-R
hodium... R
hT
in -white
1804102.9
12.1.0580
2,000.0000085
Rubidium
... Rb
Silver -white
186185.5
1.52.077
38.5O
ver-
Ruthenium
... Ru
-1828
101.712.261
.06112,400
.0000096
Samarium
... Sm-
1879150.3
7.7-
1,350-
00cc,
I-
53z5'
zaC
ME
TA
LLIC E
LEM
EN
TS
AN
D T
HE
IR P
RO
PE
RT
IES
(continued)
SpecificM
eltingC
oefficientA
tomic
Gravity
Specificpoint
of Linear
Num
ber of Symbol.
Colour.
Date.
Weight
orD
ensity.H
eat.(°C
enti-grade.)
Expan-sion.
Scandium...
So-
44.1-
--
-Silver
-... A
gW
hite-
107.910.4-10.57
.0560962
.0000192Sodium
...N
aSilver -w
hite1807
23.0.98
.29396
.000071Strontium
...Sr
Yellow
180887.6
2.5800
-T
antalum... T
aB
lack1802
181.616.8
.03-652,910
.0000079T
ellurium... T
oT
erbium... T
h--
-1843121.5160
6.25-
.049-452
.0000167-
Thall i um
...T
1B
luish -white
1861204.0
11.8.0335
303.0000302
Thorium
... Th
Grey
1828232.4
11.2.0276
1,690-
Thulium
... Tm
--
171-
--
-T
in...
... SnW
hite-
119.07.293
.0559232
.0000203T
itanium...
Ti
Dark grey
178948.1
3.6.13
1,800-
Tungsten
... WL
ight grey1783
184.019.129
.03343,000
-U
ranium... U
Greyish -w
hite1789
238.518.33
.02771,500
-V
anadium ... V
Whitish -grey
180151.1
6.9.125
1.680-
Ytterbium
... Yb
--
173.0-
--
Yttrium
...Y
tG
rey1797
89.03.80-
--
Zinc
...... Z
nB
luish -white
-65.4
7.1.0935
419.0000274
Zirconium
...Z
rG
rey1789
90.64.15
.0662O
ver1,300
-
cs
RADIO ENGINEER'S POCKET BOOK--FLUXES FOR SOLDERING
r, Metals. Fluxes. Fluxes generallyused.
IronSteelCopperBrassZinc (new) IZinc (old) fLead (with fine
solder)Lead (with coarse
solder)TinPewter
Chloride of nineSal -ammoniacChloride of zincr Resin1. Sal -ammoniac
Chloride of zincHydrochloric
acidTallow and resin
TallowResin .'or sweet
oil
Chloride of zinc(killed spirit)
Resin
COMPOSITION OF SOFT SOLDERSSolder. Composition. Melting -point
FineTinman'sPlumber'sPewterer's
Wood'sMetal
11 parts tin, 1 part lead1 part tin, 1 part lead1 part tin, 2,parts lead1 part tin, 1 part lead
and 2 parts bismuth1 part tin, 2 parts lead
4 parts bismuth, Ipart cadmium
334°F.370°F.440°F.203°F.
165°F.
A mixture of 11 parts tin and 1 part lead fuses ata lower temperature than any other mixed pro-portion of these metals.
COMPOSITION OF HARD SOLDERS
Solder. Composition.
Hard brazingHard brazingSofter brazing
3 parts copper, 1 part zinc1 part copper, 1 part zinc4 parts copper, 3 parts zinc, and
1 part tin
90
RADIO ENGINEER'S POCKET BOOK
TABLE OF DECIMAL EQUIVALENTS
V . . .015625 38/04 . . .5156251/ . . .03125 17/3'2 . . .531253/64 . . .046875 35/64 .5468751/16
-. .0625 9/16 . . .5625
5/64 . . .078125 37/64 . . .5781253/32 .09375 19/32 - .593757/64 .109375 39/64 .6093751/8 . . .1250 5/8 . . .6250
9/64 . . .140625 41/64 . . .6406255/32 . . .15625 21/82 . . .65625
11/64 . . .171875 43/64 . . .67187513/16 . . .1875 11/18 . . .687513/64 . . .203125 45/64 . . .703125
7/32 . . .21875 23/32 . . .7187515/64 -234375 47/64 -734375
1/417/64
.
.
.
.
.2500
.2656253/4
49/64.
.
.
.
.7500
.7656259/32 . . .28125 25/32 . . .78125
19/04 . . .296875 51/84 . . .7968756/16
21/04..
.
.
.3125
.32812513/1653/64
.
.
.
..8125.828125
11/32 -34375 27/32 -8437523/64 -359375 55/64 - -859375
3/825/64 . .
.375
.3906257/8
57/64.
.
.
.
.8750.890625
13/32 . . .40625 29/32 . . .9062527/84 . . .421875 59/64 . . .921875
7/1629/64
4375-453125
15/1661/64
-9375-953125
15/32 .46875 31/32 .9687581/84 .484375 63/64 -984375
1/2 . . .5000 I . . 1.0000
91
RADIO ENGINEER'S POCKET BOOK
List of Prefixesmega means a million times.kilo means a thousand times.hecto means a hundred' times.deca means ten times.deci means a tenth part of.centi means a hundredth part of.milli means a thousandth part of.micro means a millionth part of.
Square Measure100 sq. metres =1 are.10,000 sq. metres =1 hectare.
Weight10 grammes =1 decagramme.10 decagrammes =1 hectogramme.10 hectogrammes =1 kilogramme.1,000 kilogrammes =1 tonne.
Capacity1 litre =1 cubic decimetre.10 litres =1 decalitre.10 decalitres =1 hectolitre.10 hectolitres =1 kilolitre.
10 millimetres10 centimetres10 deci metres10 metres10 decametres10 hectometres10 kilometres
Length=1 centimetre.
decimetre.=1 metre.=1 decametre.=1 hectometre.=1 kilometre.=1 myriametre.
92
RADIO ENGINEER'S POCKET BOOK
Linear Measure Equivalents1 inch =2.54 centimetres, or
25.4 millimetres.1 foot =30.4799 centimetres,
304.799 milli-metres, or .3047metre.
1 yard =.914399 metre.1 mile =1.6093 kilometres=
5,280 feet.1 millimetre =.03937 inch.1 centimetre =.3937 inch.1 decimetre =3.937 inches.1 metre =39.370113 inches.
3.28084 feet.1.093614 yards.
1 kilometre =.62137 mile.1 decametre
(10 metres) =10.936 yards.METRIC CONVERSION FACTORS
To convert-Millimetres to inches . x .03937 or ± 25.4
Centimetres to inches . x .3937 or ÷ 2.54Metres to inches . . x 39.37Metres to feet . . x 3.281Metres to yards . . x 1.094Metres per second to feet
per minute . . x 197Kilometres to miles . x .6214 or ÷ 1.6093Kilometres to feet . x 3,280.8693Square millimetres to
square inches . x .00155 or 645.1Square centimetres to
square inches. . x .155 or ÷ 6.451Square metres to square
feet . . . x 10.764Square metres to square
yards . . . x 1.2
93
RADIO ENGINEER'S POCKET BOOK
METRIC CONVERSION FACTORSTo- convert --Square kilometres to acres x 247.1Hectares to acres . . x 2.471Cubic centimetres to cubic
inches . . . x .06 or ÷ 16.383Cubic metres to cubic feet x 35.315Cubic metres to cubic
yards . . . x 1.308Cubic metres to gallons
(231 cubic inches) . x 264.2Litres to cubic inches . x 61.022Litres to gallons . . x .2642 or÷3.78Litres to cubic feet . ÷ 28.316Hectolitres to cubic feet x 3.531Hectolitres to bushels
1 (2,150.42 cubic inches) x 2.84Hectolitres to cubic yards x .131Hectolitres to gallons . ÷ 26.42Grammes to ounces
(avoirdupois) . . x .035 or ÷ 28.35Grammes per cubic cm.
to lb. per cubic inch ÷ 27.7Joules to foot -lb. . . x .7373Kilogrammes to oz. . x 35.3Kilogrammes to lb. . x 2.2046Kilogrammes to tons . x .001Kilogrammes per sq. cm.
to lb. per sq. inch . x 14.223Kilogramme - metres to
foot -lb. x 7.233Kilogramme per metre
to lb. per foot. . x .672Kilogramme per cubic
metre to lb. per cubicfoot . . . x .062
Kilogramme per cheval-vapeurto lb. per h.p.. . x 2.235
Kilowatts to h.p.. . x 1.34Watts to h.p. . . 746Watts to foot -lb. per
second . . . x .7373Cheval-vapeur to h.p. . x .9863Gallons of water to lb. . x 10Atmospheres to lb. per
sq. inch . . . x 14.794
RADIO ENGINEER'S POCKET BOOK
5'z'8-nn'8054!..gag,m
II II II II 11 II II II
CO
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95
-.7=0-1!=e3soneampaligAswlowimmi...reallobt
RADIO ENGINEER'S POCKET BOOK- . ,... ..........L., -- ,ts.35.? 1,;3, 5 0 otro,, osc,1 00 n5
4'in ;1 ill gg R: ZZVV Vq F
o gg254 V' 5'5' Z;--r.-. s., a ,gi
8 . -- goEl,
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OPo.
0II II II II II II II II 111111I,......,,,, II .11 II ii 0c.s...o./..co Pe
F. `yts.,
.. e.L.,b o.o ...I ,-., i:D .. ..1..020.0:04M 1.7,-.70 4.ZADC, CD t> 5 0 '.. ....00i,$ -,00.W Ot,hP. MMW.10. MW 0, W W Itt 23 g). -4 ''' 3cnoc,40P.. pi,.., war .. ,.,Q02.3,0gre. a -46;n2'il525-1Q ''' .4 'g -iggggg2
rp ..,5574.5il 55 74: V S'
;45 2 4, 5' =P O9 Po X
a ISr. "24 0r
CD A . g' 2 3P T 2 :8 Y- Z. a
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=mg g, P 00 v.4 tsc,
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g SFI ig`Pain . 21: -50m .
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Et'11g:-5 ,--7-,-1-; 2.5 3:6x- :.g .-.8 lij K;--- ',5 5 0:- ,q:1=4
,......., ......0 00,......00 .0
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II II II .---4--,
e _X iae
mr g:.--- HsE
m.. wm 84,..otoow.,. b ...pp Caaob o ,w000N,,,00 ,-, V1 -+b 0.m oNm..o.Wmg.. 0 4.--a-4 ..... .0 IllP..,NIN, WC.0 0W
O a06,. . E 4:1-9OV.-.. 4.:-, or 0.
a 3 gi-zi 0.....g,, =p4ott.
4
,..8 r=' 2-.. ;2, g; F Pr
96
RADIO ENGINEER'S POCKET BOOK
MENSURATIONA and a =area ; b =base ; C and c=
circumference ; D and d =diameter ;h =height ; n° =number of degrees ;p=-7perpendicular ; R and r =radius ;s =span or chord ; v =versed ine.
Square : a = side2 ; side =diagonal=side x A/2.
Rectangle or parallelogram : a =bp.Trapezoid (two sides parallel): a=
mean length parallel sides x distancebetween them.
Triangle : a =Pp.Irregular figure : a =weigitt of tern-
plate±weight of square inch of similarmaterial.
Side of square multiplied by 1.4142equals diameter of its circumscribingcircle.
A side multiplied by 4.443 equalscircumference of its circumscribingcircle.
A side multiplied by 1.128 equalsdiameter of a circle of equal area.
Square inches multiplied by 1.273equals square inches of an equal circle.
a;
97
_
RADIO ENGINEER'S POCKET BOOK
MENSURATION (continued)To find side of an equal square :
Multiply diameter by 0.8862 ; ordivide diameter by 1.1284 ; ormultiply circumference by 0.2821 ;or divide circumference by 3.545.
To find area of a circle :Multiply circumference by of thediameter ; or multiply the squareof diameter by 0.7854 ; or multiplythe square of circumference by0.07958 ; or multiply the squareof -} diameter by 3.1416.
To find the surface of a sphere or globe:Multiply the diameter by thecircumference ; or multiply thesquare of diameter by 3.1416 ; ormultiply 4 times the square ofradius by 3.1416.
Cylinder.To find the area of surface :
Multiply the diameter by 3,1t xlength.Capacity=37 x radius2 x height.
Values and Powers of :n =3.1415926536, or 3.1416, or227 or 3-
1r2 = 9.86965 ; =1.772453=0.31831 ;
2=1.570796 ;
3=1.047197.
98
RADIO ENGINEER'S POCKET BOOK
MENSURATION (continued)
Circle : a =nr2=d2n =0.7854d2=0.54
cr. ; e =--2nr = dn =3.1416d=3.54 Va7=--(approximately) -2:7?'-d. Side of equalsquare =0.8862d ; side of inscribedsquare =0.7071d ; d = .3183c. A circlehas the maximum area for a givenperimeter.
Annulus of circle : a =(D + d) (Dgr gr.
Segment of Circle : a =area of4vsector - area of triangle = 3
V(0.625v)2+ (IS )2.Length of Arc 0.0174533n'r ; length
of arc (8 ,\/-s +v2- s) ;2
4approximate length of arc = 3 (8 timeschord of arc - chord of whole arc).
d= (2-' chord)+ v ; radius of curveS2 ,V8V 2
Sector of circle : a =0.5r x length arc ;=n° x area circle= 360.
RADIO ENGINEER'S POCKET BOOK
MENSURATION (continued)
Ellipse : a = Dd =Rr ; c (approx.).../D2+ d2 Dax c (approx.)-=n-.
Parabola : a = ibh.Cone or pyramid : surface
tire. of base x slant length+base;
2contents =area of base x 3 vertical height.Frustum of cone : surface=
(C c) x slant height + ends ;contents = 0.2618h (D2 + d2 + Dd) ;lh (A + a + -VA x a).
Wedge : contents =k (length of edge+2 length of back) bh.
Prism : contents =area base x height.Sphere : surface = d276 = 47g.2 ; con-
tents =d3 U 4nr3.
Segment of sphere : r =rad. of base ;contents= 713. (3r2+ h2) ; r = rad. of
6
sphere ; contents =73.3h2 (3r -h).
Spherical zone : contents =;.1h (3h2R2 ; surface of convex part ofsegment or zone of sphere = xd (of sph.)h
100
RADIO ENGINEER'S POCKET BOOK
MENSURATION (continued)Mid. sph. zone : contents = ( r 3h2) 4.Spheroid : contents =revolving axis2 x
07fixed axis xCube or rectangular solid : contents
= length x breadth x thickness.Prismoidal formula, contents =end areas + 4 times mid. area x length
6Solid of revolution: contents =a of
generating plane x c described bycentroid of this plane during revolution.Areas of similar plane figures are as thesquares of like sides. Contents of similarsolids are as the cubes of like sides.Rules relative to the circle, square,cylinder, etc. :
To find circumference of a circle :Multiply diameter by 3.1416 ; ordivide diameter by 0.3183.
To find diameter of a circle :Multiply circumference by 0.3183 ;or divide circumference by 3.1416.
To find radius of a circle :Multiply circumference by 0.15915;or divide circumference by 6.28318.
To find side of an inscribed square :Multiply diameter by 0.7071 ; ormultiply circumference by 0.2251 ;or divide circumference by 4.4428.
101
RADIO ENGINEER'S POCKET BOOK
AllikFig. 1. Diagram for Fig. 2. Diagram for
Table A. Table B.
TABLE ASee Fig. 1
PartsGiven.
Parts tobe Found.
Forinulfe.
a b c Ab2 -!c2 --a2
cos _3.- ,bc
a b A Bx sin Asin B-b a
a b A C C=130°-(A+B)
a A B baxsin B
° - sin A
a A B ca sin C a sin (A+B)
e= sin A - sin A
a b C B B -.180°- (A -1-C)
102
RADIO ENGINEER'S POCKET BOOK
'
el.
I.-'.
..
Y.,
`,':
a&
aF,:,
C.1'-'';'..;..
<T, c_.'''
8...
.''
t=,-
II II II
c,IC:c c,..ta ,..,1Q
td fe a aII
c.o9t/H. II
too. ,9,- c9,btt
I°
::-
I°
=,..
<,II i . al;ti i-F,,
ga Z.,
II
..-a
4-
.II.xg-lot
4.-
II
<,Z
F.'
.-,-
0cr.
-,,2
0a
td,t t'
07: b J-
1.,D
tla.H
c.,
c-Ha
.-II
X
OFc'
X
2fi
<,
i
C,'
... .-;
ell
iis z.
yl
.,H
- ,,,,.
II
<%+
n.
Z
rig. 3.-In any right-ang ed Fig. 3 -triangle :
BCtan A- sin A-C, BC---ABAC ACcos A=- cot A =BC-BC
secsec A= , cosec A=i,Vic, cosec
103
RADIO ENGINEER'S POCKET BOOK
Fig. 4.-In any right-angledtriangle :
a2=c2+b2c- V0,2 b2
b= V a2 e2
Vb2i-c2Pia. 4.
Fig. 5.-c A-d:a ±t::b-a:d-c.
c d d- cd-2 2
x= v62 - d2
Fig. 6.In Fig. 6, where the
lengths of three sides onlyare known :area=Vs(s - a) (s - b) (s - c)
a+b-Frwhere s- -2
Fig. 7.-In this diagram :b2
a : b b :c, or (7
Fig. 7.
104
RADIO ENGINEER'S POCKET BOOK
Fig. 8.
Fig. 8.-In an equilateraltriangle ab = 1, thencd = V0.75 = 0.866,and ad = 0.5 ; ab = 2,then cd = V.3.0 = 1.732,and ad = 1; cd = 1,then ac = 1.155 and ad
b = 0.577 ; cd = 0.5, thenac = 0.577 and ad = 0.288.
Fig. 9.-In a right-angled triangle with twoequal acute angles, be=ar.bc = 1, then ab=1.414 ; ab = 1, thenbc = V0.5 = 0.707.
Fig. 10.
Fig. 11 de- ...,..-monstrates thattriangles on thesame base andbetween thesame parallelsare equal inarea ; thus -AABC = ADC.
a Fig. 10 showsthat parallelo-grams on thesame base andbetween thesame parallels
4 are equal ; thusABCD=ADEF.
Fig. 11.
105
TR
IGO
NO
ME
TR
ICA
L. EQ
UIV
ALE
NT
SSine
=- C
os2.Sine
= 1 ÷
Cosec.
Sine- C
os ÷ C
otan.Sine
= T
an ÷ Sec.
Cosine
- Sin2,C
osine = 1 ÷
Sec.C
osine = Sin x C
otan.C
osine = Sin ÷
Tan.
Secant .= 1 ÷
Cos.
SecantT
an ÷ Sin.
Cosecant
= 1 ÷
Sin.T
angent- 1 ÷
Cotan.
Tangent
= Sin ÷
Cos.
Cotangent =
1 -÷ T
an.C
otangent = C
os ÷ Sin.
Versine
= 1 - C
os.C
oversine = 1 - Sin.
1- T
an x Cotan.
1=
Sin2C
os2.Secant2
Tan2.
TR
IGO
NO
ME
TR
ICA
L FU
NC
TIO
NS
RIG
HT
-AN
GL
ED
TR
IAN
GL
ES
(See Fig. -1.)
5. ab7
Sin A =
,Sec A
=T
an A =
-
Cos A
= 5-
Cosec A
...b-
Cotan A
= c'
a-
-V
ersin A=
bc
Coversin A
=b
ba
0Ocn2°LU
/TA
BLE
OF
SLID
E R
ULE
GA
UG
E P
OIN
TS
Know
n value on SlideR
equired value on Rule
Set toO
nSlide
On
Rule
Pounds per square inch..
Atm
ospheres..
....
48533
Pounds per square inch..
Water, head, feet
....
1330
Pounds per square inch..
Water, head, m
etres..
3325
Pounds per square inch..
Inches, mercury gauge
.25
51Inches, w
ater gauge..
..Pounds per square inch
..360
13Inches, w
ater gauge..
..Inches, m
ercury gauge..
141
Inches, mercury gauge
..A
tmospheres
....
301
Atm
ospheres..
....
Kilos per square centim
etre..
8992
Pounds per square foot..
Kilos per square m
etre.
87425
Pounds per lineal foot ....
Kilos per lineal m
etre ....
4161
Pounds per lineal mile
..K
ilos per kilometre
....
7120
Pounds per cubic foot..
Kilos per cubic m
etre..
39625
Cubic feet of w
ater..
..W
eight in pounds..
..17
1060C
ubic feet of water
....
Gallons (im
perial)..
..17
106G
allons of water
....
Weight, kilos
....
..108
490Pounds of w
ater (fresh)..
Pounds of water (sea)
..38
39B
ritish thermal unit
....
Calories
....
..250
63B
ritish thermal unit per pound
Calories per kilogram
me
..9
5Foot pounds
....
..K
ilogramm
etres..
..340
47H
orse -power
....
..Force de cheval
....
7273
,.........-
00coOcc0acc
TA
BLE
OF
SLID
E R
ULE
GA
UG
E P
OIN
TS
-(continued)
Know
n value on SlideR
equired value on Rule
Set toO
nSlide
On
Rule
Pounds per H.P. ..
....
Kilos per cheval ..
....
300134
Horse -pow
er per hour..
..K
ilowatts (B
.T.U
.)..
..134
100W
atts..
....
..H
orse -power
....
-5
.0067C
ircle, diameter ..
....
Circle, circum
ference..
..225
710C
ircle, diameter ..
....
Circle, side of inscribed square..
9970
Circle, diam
eter..
....
Circle, side of equal square
..79
70C
ircle, diameter ..
....
Circle, side of equal equilateraltriangle
....
..12
97C
ircle, circumference
....
Circle, side of inscribed square ..
409
Circle, circum
ference..
..C
ircle, side of equal square..
3911
Circle, area
....
..Inscribed square area
....
300191
Square, side..
....
Square, diagonal ....
..70
99Inches
....
....
Centim
etres...
....
50127
Inches, eighths-
....
Millim
etres..
....
40127
Feet..
....
..M
etres..
....
..292
89Y
ards..
....
..M
etres..
....
..35
32M
iles..
....
..K
ilometres
....
..87
140Square inches
....
..Square centim
etres..
..31
200Square feet
....
..Square m
etres..
....
14013
Square yards..
....
Square metres
....
..161
51
cc
SeOCC
I
01.11
z00
TA
BLE
OF
SLID
E -R
ULE
GA
UG
EPO
INT
S --(continued)
Know
n value on SlideR
equired value on Rule
Set toO
nSlide
On
Rule
Square miles
....
..Square kilom
etres..
112290
Acres
....
....
Hectares
....
..42
17C
ubic inches..
....
Cubic centim
etres..
..36
590C
ubic feet..
..C
ubic metres
....
1063
Cubic feet
__
..L
itres..
--
-3
85C
ubic yards..
....
Cubic m
etres..
....
5139
Gallons
....
..U
.S. Gallons
....
..5
6B
ushels..
....
..C
ubic metres
....
..110
4O
unces (Avoirdupois)
....
Gram
mes ..
..67
1900O
unces (Avoirdupois)
....
Kilogram
mes
....
67019
Pounds (Avoirdupois)
....
Kilogram
mes
..280
127H
undredweights -
..
..K
ilogramm
es..
5254
Tons
....
....
Tonnes
....
....
6263
Feet per second..
.M
etres per minute
....
7128
Feet per second..
....
Miles per hour
....
..22
15Feet per m
inute..
..M
iles per hour..
....
2643
Yards per m
inute..
..M
iles per hour..
....
883
Miles per hour
....
..M
etres per minute
..32
322K
nots..
..M
etres per hour ....
..33
38Pounds per square inch ..
..K
ilogramm
es per square centi-m
etre..
....
..128
9
00U cC0ILI
"Zi
00ce
POW
ER
S AN
D R
OO
TS O
F17. A
ND
g
n1-ii.
n2
n3
Vn
1
%in
85/ ri132/n
7r= 3.142
0.3189.870
31.0061.772
0.5641.465
0.68327c=
6.2830.159
39.478248.050
2.5070.399
1.8450.542
rc- - 1.5712
0.6372.467
3.8781.253
0.7981.162
0.860re- -
1.0473 -
0.9551.097
1.1481.023
0.9771.016
0.9854-rc =
4.1893
0.23917.546
73.4962.047
0.489I.612
0.622
n=
0.78.54
1.2740.617
0.4840.886
1.1280.923
1.084
73
It .---0.524
1.9100.274
0.1440.724
1.3820.806
1.241
r2= 9.870
0.10197.409
90] .3903.142
0.3182.145
0.466n3=
31.0060.032
961.39029,809.910
5.5081.796
3.1420.318
.32=
0.09810.186
0.00950.001
0.3133.192
0.4612.168
g = 32.2
0.0311036.84
33,386.245.674
0.1763.181
0.3142g - 64.4
0.0154147.36
267,0908.025
0.1254.007
0.249
0ri
00U cC11
00ce
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00W.7-
A.
<U)
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84
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NNNNNOGiNNN
.000912NW007t-
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0.0t...0.n.
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grirINNNC4NCO
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t-c0C-k0.17.
t,..010eNN.
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gj
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NON...N
.Nc0k0C-0.40000NCo
OMNM,311...0).M)0
ONL.....t.MOCACOW
. ...40101010
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NOINO..
r'l"owm.cm0,n1Ncch).O*.e
VCI)
01,,towcip0.o.t0oco=
0.VNNOI
gw7twVo- gCo-N
;1c,0 a
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eMe.0
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6,,,I,,,,,,,a,
0.0M,V)0e0C-(47)
..........
0.10175.:14100t,.W05
NOINNNNNOINO
C.0,1c0,40
MONMM07
RADIO ENGINEER'S POCKET BOOK
POWERS AND ROOTS (continued)
No. Squares. CubesSquareRoots.
CubeRoots.
36 1 296 46 656 6.000 3.30237 1 369 50 653 6.083 3.33238 1 444 54 872 6.164 3.36239 1 521 59 319 6.245 3.391
40 1 600 64 000 6.325 3.42041 1 681 68 921 6.403 3.44842 1 764 74 088 6.481 3.47643 1 349 79 507 6.557 j3.50344 1 936 85 184 6.633 3.53045 2 025 91 125 6.708 3.55746 2 116 97 336 6.782 3.58347 2 '209 103 823 6.856 3.60948 2 304 110 592 6.928 3.63449 2 401 117 649 7.000 3.659
50 2 500 125 000 7.071 3.68451 2 601 132 651 7.141 3.70852 2 704 140 608 7.211 3.73353 2 809 148 877 7.280 3.75654 2 916 157 464 7.348 3.78055 3 025 166 375 7.416 3.80356 3 136 175 616 7.483 3.82657 3 249 185 193 7.550 3.84958 3 364 195 112 7.616 3.87159 3 481 205 379 7.681 3.893
60 3 600 216 000 7.746 3.91501 3 721 226 981 7.810 3.93662 3 844 238 328 7.874 3.95863 3 969 250 047 7.937 3.979(54 4 096 262 144 8.000 4.00065 4 225 274 625 8.062 4.02166 4 356 287 496 8.124 4.04167 4 489 300 763 8.185 4.06268 4 624 314 432 8.248 4.08269 4 761 328 509 8.307 4.102
112
RADIO ENGINEER'S POCKET BOOK
POWERS AND ROOTS (continued)
- o. Squares. 'Cubes. Square CubeRoots.
Roots.
70 4 900 343 000 8.367 4.1217) 5 041 357 911 8.426 4.14172 5 184 373 248 8.485 4.16073 5 329 389 017 8.544 4.17974 5 476 405 224 8.602 4.19875 5 625 421 875 8.660 4.21776 5 776 438 976 8.718 4.236
' 77 5 929 456 533 8.775 4.25478 .6 084 474 552 8.832 4.27379 6 241 493 039 8.888 4.201
80 6 400 512 000 8.941 4.30981 6 561 531 441 9.000 4.32782 6 724 551 368 9.055 4.34483 6 889 571 787 9.110 4.36284 7 056 592 704 9.165 4.38085 7 225 614 125 9.220 4.39786 7 396 636 056 9.274 4.41487 7 569 658 503 9.327 4.43188 7 744 681 472 9.381 4.44889 7 921 704 969 9.434 4.465
90 8 100 729 000 9.487 4.48191 8 281 753 571 9.539 4.49892 8 464 778 688 9.592 . 4.51493 8 649 804 357 9.644 4.53194 8 836 830 584 9.695 4.54795 9 025 857 375 9.747 4.56396 9 216 881 736 9.798 4.57997 9 409 912 673 9.849 4.59598 9 604 941 192 9.899 4.61099 9 801 970 299 9.950 4.626
100 10 000 1 000 000 10.000 4.642
113
SG
002Nw w
CO
MP
AR
AT
IVE
RE
SIS
TA
NC
E O
F V
AR
IOU
S M
ET
ALS
AN
D A
LLOY
SR
esistivity in InternationalM
icrohms at 0° C
ent.R
elativeM
aterial.R
esistance.C
entimetre C
ube.Inch C
ube.
Annealed Silver
....
..1.48
0.5831
Annealed C
opper..
....
1.55 to 1.610.610 to 0.633
1.04 to 1.09H
ard -drawn Silver
....
1.580.622
1.07H
ard -drawn C
opper..
..1.59 to 1.64
0.626 to0.646
1.07 to 1.11A
nnealed Gold
....
..2.05
0.8071.38
Hard -draw
n Gold
..
2.0890.822
1.41A
nnealed Alum
inium..
..2.43
0.961.64
Silicium B
ronze..
....
2.50.98
1.69Pressed Z
inc ....
....
5.612.21
3.79T
ungsten..
....
..6.4
2.54.3
Annealed N
ickel..
....
6.942.73
4.69Phosphor B
ronze..
....
7.803.07
5.27A
nnealed Platinum..
9.043.65
6.09A
nnealed Iron..
...
9.73.82
6.66G
old -Silver alloy (2 oz. gold, 1 oz.Silver) hard or annealed ..
..10.8
4.277.33
Pressed Tin
....
....
13.25.19
8.9
00I -c,
00
CO
MP
AR
AT
IVE
RE
SIS
TA
NC
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Material.
Resistivity in InternationalM
icrohms at 0° C
ent.R
elativeR
esistance.C
entimetre C
ube.Inch C
ube.
Pressed Lead..
....
19.67.71
13.2G
erman Silver
....
..19.0 to 42.2
7.48 to 11.812.8 to 20.2
Platinum -Iridium
alloy(density
21.32)..
....
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8.7315.0
Silver) hard or annealed ....
24.39.58
16.4Platinoid
....
....
3413.4
23Pressed A
ntimony
....
..35.4
13.923.8
Manganin
....
...
.42
16.728.7
Nickelin
....
....
4317
29E
mtka
4718.5
32Ja Ja
....
..61
2034.5
Krzpin
....
..85
3357
Mer ury
....
..94.08
37.0463
Pr sed Bism
uth..
..108
42.573
Carbon
....
4,000 to 10,0001,600 to 4,000
2,700 to 6,700
RADIO ENGINEER'S POCKET BOOK
ENGLISH WEIGHTS & MEASURESLONG MEASURE
12 inches (in.) --3 feet51 yards.40 poles (220
yards) =--
8 furlongs (1,760yards)
3 miles1 chain10 chains6 feet6,080 feet per
hour4 inches
1 foot (ft.)1 yard. (yd.)1 rod, pole or perch
1 furlong (furl.)
1 mile (m.)=1 league
100 links (22 yards)1 furlong
=1 fathom
1 knot=1 hand
AREA (Square Measure)144 square inches=1 square foot.9 square feet =1 square yard301 square yards=1 square pole40 square poles =1 rood4 roods =1 acre (4,840
square yards)640 acres =1 square mile
MEASURES OF VOLUME AND CAPACITY(Cubic Measure)
1,728 cubic inches=1 cubic foot.27 cubic feet =1 cubic yard1 marine ton =40 cubic feet1 stack =108 cubic feet1 cord =128 cubic feet
116
RADIO ENGINEER'S POCKET BOOK
MEASURE OF CAPACITY(Liquid or Dry Measure)
4 gills2 pints2 quarts2 pottles4 quarts2 gallons4 pecks8 bushels
12 bags5 quarters2 loads
Wine2 pints4 quarts
10 gallons18 gallons42 gallons2 tierces11 puncheons2 pipes
Ale and'4 gills2 pints4 quarts9 gallons2 firkins2 kilderkins11 barrels11 hogshead11 puncheons
=1 pint=1 quart=1 pottle=1 gallon=1 gallon=1 peck=1 bushel=1 quarter=1 chauldron=1 load=1 lastMeasure=1 quart=1 gallon
anker=1 runlet or rundlet=1 tierce=1 puncheon=1 pipe or butt=1 tun
Beer Measure=1 pint=1 quart=1 gallon=1 firkin=1 kilderkin=1 barrel=1 hogshead=1 puncheon=1 butt or pipe
117
RADIO ENGINEER'S POCKET BOOK
Avoirdupois Weight27.34375 grains =1 dram16 drams =1 ounce16 ounces =1 pound (lb.)14 pounds =1 stone2 stone (28 lb.) =1 quarter4 quarters =lhundredweight(cwt.)20 cwt. =1 ton100 lbs. =1 cental
Apothecaries Weight20 grains =1 scruple3 scruples =1 drachm8 drachms =1 ounce12 ounces =1 pound
Apothecaries' Fluid Measure60 minims =1 fluid drachm
8 drachms =1 fluid ounce20 ounces =1 pint
8 pints =1 gallonDiamond and Pearl Weight
3.17 grains =1 carat, or4 pearl grains =1 carat151i carats =1 ounce (troy)
Paper Measure24 sheets =1 quire20 quires =1 ream2 reams =1 bundle10 reams =1 bale
Troy Weight3.17 grains -1 carat24 grains =1 pennyweight (dwt.)20 pennyweights =1 ounce12 ounces =1 pound1 lb. =5,760 grains1 lb. avoir. =7,000 grains
118
RADIO ENGINEER'S POCKET BOOK
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15°30'0.2672
.96360.2773
23° 0'0.3907
.92050.4245
16° 0'0.2756
.96130.2867
30'0.3987
.91700.4348
30'0.2840
.95880.2962
24° 0'0.4067
.91360.4452
17° 0'0.2924
.95630.3057
30'0.4147
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0.455730'
0.3007.9537
0.315325° 0'
0.4226.9063
0.466318° 0'
0.3090.9510
0.324930'
0.4305.9025
0.477030'
0.3173.9483
0.334626° 0'
0.4384.8988
0.487719° 0'
.03256.9455
0.344330'
0.4462.8949
0.498630'
0.3338.9426
0.354127° 0'
0.4540.8910
0.509520° 0'
0.3420.9397
0.364030'
0.4617.8870
0.520630'
0.3502.9367
0.373928° 0'
0.4695.8829
0.531721° 0'
0.3584.9336
0.383930'
0.4772.8788
0.543030'
0.3665.9304
0.393929° 0'
0.4818.8746
0.554322° 0'
0.3746.9272
0.404030'
0.4929.8704
0.565830'
0.3827.9239
0.414230° 0'
0.5000.8660
0.5774.111111/11i0011106
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30°30'0.5075
.86160.5891
38° 0'0.6157
.78800.7813
31° 0'0.5150
.85720.6009
30'0.6225
.78260.7954
30'0.5225
.85260.6128
39° 0'0.6293
.77720.8098
32° 0'0.5299
.84800.6249
30'0.6361
.77160.8243
30'0.5373
.84340.6371
40° 0'0.6428
.76600.8391
33° 0'0.5446
.83870.6494
30'0.6494
.76040.8541
30'0.5519
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41° 0'0.6561
.75470.8693
34° 0'0.5592
.82900.6745
30'0.6626
.74900.8847
30'0.5664
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42° 0'0.6691
.74310.9004
35° 0'0.5736
.81920.7002
30'0.6756
.73730.9163
30'0.5807
.81420.7133
43° 0'0.6820
.73140.9325
36° 0'0.5878
.80900.7265
30'0.6884
.72540.9489
30'0.5948
.80390.7400
44° 0'0.6947
.71930.9657
37° 0'0.6018
.79860.7536
30'0.7009
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30'0.6088
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45° 0'0.7071
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45°30'0.7133
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53° 0'0.7986
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46° 0'0.7193
.69471.0355
30'0.8039
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30'0.7254
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54° 0'0.8090
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47° 0'0.7314
.68201.0724
30'0.8141
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30°0.7373
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55° 0'0.8192
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48° 0'0.7431
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30'0.8241
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30'0.7490
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56° 0'0.8290
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49° 0'0.7547
.65611.1504
30'0.8339
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30'0.7604
.64951.1709
57° 0'0.8387
.54461.5399
50° 0'0.7660
.64281.1918
30'0.8434
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30'0.7716
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58° 0'0.8480
.52991.6003
51° 0'0.7771
.62931.2349
30'0.8526
.52251.6319
30'0.7826
.62251.2572
59° 0'0.8572
.51501.6643
52° 0'0.7880
.61571.2799
30'0.8616
.50751.6977
30'0.7934
.60881.3032
60° 0'0.8660
.50001.7321
81
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Degrees.
Sine.C
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60°30'0.8704
.49241.7675
68° 0'0.9272
.37462.4751
61° 0'0.8746
.48481.8041
30'0.9304
.36652.5387
30'0.8788
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69° 0'0.9336
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62° 0'.0.8830
.46951.8807
30'0.9367
.35022.6746
30'0.8870
.46181.9210
70° 0'0.9397
.34202.7475
63° 0'0.8910
.45401.9626
30'0.9426
.33382.8239
30'0.8949
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71° 0'0.9455
.32562.9042
64° 0'0.8988
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30'0.9483
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30'0.9026
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72° 0'0.9510
.30903.0777
65° 0'0.9063
.42262.1445
30'0.9537
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30'0.9100
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73° 0'0.9563
.29243.2907
66° 0'0.9135
.40672.2460
30'0.9588
.28403.3759
30'0.9171
.39882.2998
74° 0'0.9613
.27563.4874
67° 0'0.9205
.39072.3559
30'0.9636
.26723.6059
30'0.9239
.38272.4142
75° 0'0.9659
.25883.7321
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75°30'0.9682
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83° 0'0.9926
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76° 0'0.9703
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30'0.9936
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84° 0'0.9945
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77° 0'0.9744
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30'0.9954
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30'0.9763
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0.9962.0872
11.430178° 0'
0.9782..2079
4.704630'
0.9969.0785
12.706230'
0.9800.1994
4.915286° 0'
0.9976.0698
14.300779° 0'
0.9816.1908
5.144630'
0.9981.0610
16.349930'
0.9833.1822
5.395587° 0'
0.9986.0523
19.081180° 0'
0.9848.1737
5.671330'
0.9990.0436
22.903830'.
0.9863.1650
5.975888° 0'
0.9994.0349
28.636381° 0'
0.9877.1564
6.313830'
0.9997.0262
38.188530'
0.9890.1478
6.691289° 0'
0.9998.0174
57.2900,
82° 0'0.9903
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30'0.9999
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INDEX
AAbbreviations, 11, 12, 26
, amateur, 70, international, 70
A.C., Ohm's law for, 24Accumulator, acid for, 49- charging, 49
data, 49paste, 50
Acorn valve base connections, 26Aerial data, 32
, frame, 33length of, 32
- reflector, 32, wire for, 32
Air, S.I.C. of, 55Alphabet, Greek, 83
phonetic, 75Aluminium, 87-, density of, 64-, weight of, 57Amateur abbreviations, 70- call signs, 73
wave bands, British, 76American valve base connections, 26
wire gauge, 79-82Ampere hour, 16
, international, 16turns, 16
Anti -logarithms, 129-132Antimony, 87
, weight of, 57Anulus. formula for, 99
133
L
Arc, formula for, 99Argontan, specific resistance of, 56Arsenic, 87
B
B.A. threads, tapping sizes for, 59Band-pass tuners, 25Barium, 87Battery leads, colour codes of, 67Beryllium, 87Birmingham wire gauge, 79Bismuth, 87
, weight of, 57Bornite, 46Brass, flux for, 90
, weight of, 57Brazing spelter, 90British amateur wave -band, 76
Association screws, 58- Imperial Standard wire gauge, 79- Standard fine threads, 59
Thermal Unit, 19Bromine, 87Brown and Sharpe wire gauge, 79,
CCadmium, 87Caesium, 87Calcium, 87Calido, specific resistance of, 56Call signs, amateur, 73-74Calorie, 19Capacity of fixed condenser, 24
of variable condensers, 23, unit of, 16
Carborundum, 46Cassiterite, 46Cast iron, specific resistance of, 56
-, weight of, 57134
Centigrade heat unit, 19Centimetre, 92Cerium, 87Chords of circles, 86Chromium, 87Circle, formula for, 99
, formula relative to, 53, 101-, sector for, 99
, segment for, 99Circles, chords of, 86Circuit, series, current in, 25
, tuned, resistance of, 25Circuits symbols, 13Climax, specific resistance of, 56Cobalt, 87Code, colour, 66
, international " Q," 68, 69, Morse, 72, " QRK," 71, " QSA," 71, " RST," 71
Coil data, long -wave, 34, medium -wave, 35, short-wave, 35-44
, single -layer, inductance of, 25Coils, band-pass, 25
, reactance of, 25Colour codes, 66-67Columbium, 87Condenser blocks, colour code of, 66-, fixed, capacity of, 24
reactance of, 25series, 24
Condensers, colour code of, 66-, parallel, 24-, variable, capacity of, 23Conductance, unit of, 17Cone, formula for, 100Constantan, specific resistance of, 56Continental valve base connections, 30Conversion factors, metric, 93
135
Copper, 87, density of, 64, flux for, 90;specific resistance of, 56
-, weight of, 57- wire data, 77Cosecant of angle, 103Cosine of angle, 103Cosines, table of, 119-124Cotangent of angle, 103Coulombs, 21Crystal combinations, 46
data, 46Crystals, chemical symbols for, 46Current -carrying capacity of lamps, 48
unit of 16
DD.C., Ohm's law for, 24Deaf -aid valve base connections, 26Decagramme, 92Decametre, 92Decibel defined, 83Decibels and power ratio, 83Decimal equivalents, 91Decimetre, 92Decoupling resistances, 47Dielectric constants, 55
strengths, 55Drills and drilling, 59
, gauge sizes of, 60, letter sizes of, 60, twist, 60, 61
Duralumin, weight of, 57Dynamic energy, 18Dyne, 16, 18
EEbonite, dielectric strength of, 55
S.I.C. of, 55136
Ebonite, weight of, 57Electric motor, horse -power of, 85Electrical equations, 21Electrolyte jelly, 51
, neutralising, 51Elements, metallic, 87Ellipse, formula for, 100Energy, 18English weights and measures, 116-118; metric
equivalents, 95-96Equivalents, decimal, 91
of metric weights and measures, 95-96Erbium, 87Erg, 18Eureka resistance wire, 45
, specific resistance of, 56Excello, specific resistance of, 56
FFerro -nickel, specific resistance of, 56Fine solder, 90Fixed condenser, capacity of, 24 'Flint glass, S.I.C. of, 55Fluxes for soldering, 90Foot pound, 18
poundal, 18, 21Force, 18Frame aerial data, 33Frequency formula, 22
of musical notes, 84wavelength conversion table, 65
Frustum of cone, formula for, 100Fuses, colour code of, 66
Gg, powers and roots of, 110Gadolinum, 87Galena, 46Gallium, 87Gauge points for slide rule, 107
137
flanges, wire and sheet -metal, 79-82German silver, specific resistance of, 56Germanium, 87Glass, dielectric strength of, 55
, flint, S.I.C. of, 55plate, S.I.C. of, 55
Glucinum, 87Gold, 87
and silver wire gauge, 79-, density of, 64
, weight of, 57Gramme, 92Graphite, 46Great Calorie, 19Greek alphabet, 83
HHard solders, 90Heat, 19Hectograrnme, 92Hectometre, 92Hertzite, 46H.F. metal rectifiers, 53High -frequency transformer ratio, 23
tension metal rectifiers, 52Hivac midget valve base connections, 30Horse -power, 20, 21, 85
hour, 20
IIce, density of, 64Ideal, specific resistance of, 56Indium, 87Inductance formula, 22
of single layer coils, 25, unit of, 16
Inductive reactance, 22International abbreviations, 70
amateur call signs, 73ampere, 16
138
International Morse code, 72- ohm, 16- Q. code, 68, 69- Q.R.K. code, 71
Q.S.A. code, 71- R.S.T. code, 71- volt, 17
watt, 17Iridium, 88Iron, 88
, density of, 64flux for, 90
- pyrites, 46-, specific resistance of, 56
, weight of, 57Irregular figure, formula for, 97
JJelly electrolyte, 51Joule, 18Joules, 21
KKilocycles to metres, converting, 65Kilogramme, 92Kilometre, 92Kilowatt hour, 20, 21Kilowatts, 21Kinetic energy, 18Krupp metal, specific resistance of, 56
LL.T. metal rectifiers, 54Lamps, current -carrying capacity of, 49Lancashire wire gauge, 79, 80Lanthanum, 88Lead, 88
, density of, 64, flux for, 90
-, specific resistance of, 56139
Lead, weight of, 57Letter sizes of drills, 60Linear measure, 93Liquids and solids, density of, 64Lithium, 88Logarithms, 125-128Long -wave coil data, 34
MMagnesium, 88
, weight of, 57Magnetic pole, unit of, 17Mains transformer data, 46
transformers, colour code of, 67Malachite, 46Manganese, 88Manganin, specific resistance of, 56Medium wave coil data, 35Megadyne, 18Mensuration, 97-101Mercury, 88
density of, 64, weight of, 57
Metal gauges, 79-82rectifiers, H.F., 53
, H.T., 52L.T., 54
Metallic elements, 87-89Metals, weight of, 57
, resistance of, 114-115Metre, 92Metres to kilocycles, converting, 65Metric conversion factors, 93, 94- system, 92-94
weights and measures, equivalents of, 95Mica, dielectric strength of, 55
, S.I.C. of, 55Micanite, dielectric strength of, 55Millimetre, 92Molybdenite, 46Molybdenum, 88
140
Monel metal, specific resistance of, 56Morse code, 72Mullard side -contact valves, connections for, 30Music wire gauge, 81, 82Musical notes, frequency of, 84Myriametre, 92
NNatural wavelength of aerial, 32Neodymium, 88Nichrome, specific resistance of, 56Nickel, 88
, density of, 64-, specific resistance of, 56
, weight of, 57Niobium, 88Notes, musical, frequency, 84
0Octal valves, base connections for, 26Ohm, international, 16Ohm's law for A.C., 24
for D.C., 24Old English wire gauge, 82Osmium, 88
PPalladium, 88Paper, S.I.C. of, 55Parabola, formula for, 100Paraffin wax, S.I.C. of, 55Parallel condensers, 24
resistances, 24Pastes for accumulators, 50Peak separation, 25Pendulum. length of, 19Petrol engine, horse -power of, 85Pewter, flux for, 90Pewterer's solder, 90Phonetic alphabet, 75
141
a and g, powers and roots of, 110Pinion wire gauge, 79, 80Plate glass, S.I.C. of, 55Platinoid, specific resistance of, 56Platinum, 88
, density of, 64-, weight of, 57
Plumber's solder, 90P.M.G. aerial, 32Porcelain, dielectric strength of, 55Potassium, 88Potential, unit of, 17Poundal, 18Power, 21
ratio and decibels, 83, unit of, 17
Powers and roots of numbers, 111-113of a and g, 110
Praseodymium, 88Prefixes, 13, 92Presspahn, dielectric strength of, 55
, S.I.C. of, 55Prism, formula for, 100Pyramid, formula for, 100
Radium, 88Reactance, 22---, net, 25
of coils, 25- of condenser, 25Rectangle, formula for, 97Rectifiers, H.F. metal, 53
, H.T. metal, 52, L.T. metal, 54
Reflector aerial, 32Resista, specific resistance of, 50Resistance of metals, 114-115
, unit of, 17Resistances, colour code of, 66
142
Resistances for decoupling, 47, 48for voltage dropping, 47, 48in parallel, 24in series, 24
Rheostan, specific resistance of, 56Rheostine, specific resistance of, 56Rhodium, 88Roots and powers of numbers, 111
of and g, 110Rose's metal, specific resistance of, 56Rubber, dielectric strength of, 55Rubidium, 88Ruthenium, 88
SSamarium, 88Scandium, 89Screw threads, B.S.F., 59
, Whitworth, 59Screws, British Association, 58-, wood, proportions of, 61, 63
-, sizes of, 62, 63Sea water, density of, 64Secant of angle, 103Sector of circle, formula for, 99Segment of circle, formula for, 99
of sphere, 100Series circuit, current in, 25- condensers, 24- resistances, 24Sheet metal gauges, 79-82Shellac, dielectric strength of, 55
, S.I.C. of, 55Short-wave coil data, 36-44Sidereal time, 19Silicon, 46Silver, 89
, density of, 64--, weight of, 57
wire gauge, 79, 80$irke of an angle, 103
140
Sines, cosines and tangents, 119-124Slide rule gauge points, 107-109Sodium, 89Soft solders, compositions of, 90Soldering, fluxes for, 90Solders, composition of, 90
, hard, 90, soft, 90
Solids and liquids, density of, 64Specific gravity of accumulator acid, 49
resistance of materials, 56Spelter, 90Sphere, formula for, 100Spherical zone, 100Spheroid, formula for, 101Square, formula for, 97Stalloy core stampings, 45Stampings, stalloy, 45Standard wire gauge, 79-80Steam-engine, horse -power of, 85Steel, flux for, 90
, specific resistance of, 66, weight of, 57
Strontium, 89Stub's iron gauge, 79-80Superior, specific resistance of, 56Symbols, 13
TTangent of angle, 103Tangents, table of, 119-124Tantalum, 89Tapping sizes for screws, 59Tellurium, 46, 89Terbium, 89Thallium, 89Theoretical signs, 14Therlo, specific resistance of, 56Therm, 19Thorium, 89
144
Thulium, 89Time, 19Tin, 89
, density of, 64, flux for, 90stone, 46
, weight of, 57Tinman's solder, 90Titanium, 89Tonne, 92Transformer data, 45
, mains, 46ratio, H.F., 23
Trapezoid, formula for, 97Triangle, formula for, 97Trigonometrical equivalents, 106
formula, 102functions, 106
- tables, 119Tuned circuit, magnification of, 25
, resistance of, 25, wavelength of, 22
Tungsten, 89, density of, 64
Twist drill gauge sizes, 60drills, letter sizes of, 60-- for wood screws, 61
IIUnit, B.O.T., 16
charge, 16- of capacity, 16- of conductance, 17
of current, 16of force, 18
- of inductance, 16of magnetic polo, 17of potential, 17of power, 17of resistance, 17
145
Units, 13,and equivalents, 20, international, 17
Uranium, 89density of, 64
VValve base connections, acorn, 26
, continental, 30, deaf -aid, 26, Octal, 26
-- contact arrangements, 27, Hivac, midget base connections for, 30leg spacing, 31symbols, 15
Valves, Mullard side -contact connections, 30Vanadium, 89Variable condensers, capacity of, 23Volt, international, 17Voltage dropping resistances, 47
WWashburn and Moen wire gauge, 81Water, density of, 64Watt, 20, 21
, international, 17Watts dissipated, 24Wave bands, amateur, 76Wavelength formula, 25- -frequency conversion table, 65- of aerial, 32- of tuned circuit, 22Wedge, formula for, 100Weight of ebonite,. 57
of metals, 57Weights and measures, 116-118
, equivalents of Imperial metric, 95-96Whitworth threads, tapping sizes for, 59Wire, Eureka, 45- data, copper, 77
146
Wire for aerial, 32gauges, 79
Wood's metal, 90, specific resistance of, 56
Wood -screw proportions, 61Wood -screws, clearing sizes for, 59
, sizes of, 60, 62, twist drills for, 61
Wrought iron, weight of, 57
YYtterbium, 89Yttrium, 89
Zinc, 89, density of, 84, flux for, 90
-, specific resistance of, 56, weight of, 57
Zincite, 46Zirconium, 89
Printed in Great Britain byButler & Tanner Ltd., Frome and London
147
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WIRELESS TRANSMISSIONBy F. J. CAMM
A book which covers fully and clearlythe whole field of wireless transmissionfor the amateur enthusiast, from theobtaining of an amateur transmittinglicence to the construction and opera-tion of a transmitter. The contentsinclude : Fundamental Principles,Valves, Transmitting Circuits, TheRadio -Frequency Power Amplifier,Modulation Systems, Electronic Radia-tion, One -Valve Battery -OperatedTransmitter, Aerials, Station Layout,Frequency Meters, H.T. Supplies, Ten -Watt A.C. Operated Transmitter, etc.With 120 illustrations.
5/- net. (By post 5/6)
EVERYMAN'SWIRELESS BOOK
By F. J. CAMMGeneral Principles of Wireless Re-
ceivers. Testing. Special Remediesfor local conditions. Noises, theirCause and Remedy. Equipment.Troubles. Short -Wave Troubles. Im-proving the Quality of Reproduction.Accumulators and Batteries, etc. With200 illustrations and diagrams.
6/. net. (By post 6/6)Of all Booksellers, or by post from :
GEORGE NEWNES, LTD., (Book Dept.),Tower House, Southampton Street, Strand,
London, W.C.2.
WIRELESS COILS,CHOKES & TRANSFORMERS
And How to Make ThemBy F. J. CAMM
Chapters on Coils : Types and Prin-ciples, Resistance, Inductance, andCapacity, Screened Coils : Materialsand Construction Circuits, A Band PassUnit, Screened Superhet Coils, Short -Wave Coils, Screened Short -Wave Coils,Adjusting and Testing Coils, An All -Wave Tuner, H.F. Chokes, L.F. andSmoothing Chokos, Low -FrequencyTransformers, Making Mains Trans-formers, Coil Data and Formulae, etc.With 126 illustrations.
5/- net. (By post 5/6)
RADIOTRAINING MANUALFOR THE SERVICESAND THE TRADEEdited by F. J. CAMM
A complete course on the principlesand practice of radio. Specially de-signed and graded for students andthose desiring to enter the Services.
5/- net. (By post 5/6)Of all Booksellers, or by post from :
GEORGE NEWNES, LTD., (Book Dept.),Tower House, Southampton Street, Strand,
London, W.C.2.
THESUPERHET MANUAL
Edited by F. J. CAMMThis important new book is devoted
to modern Superhets and deals withfundamental principles of radio, prob-lems of selectivity, valve fundamentals,the principles of the Superhet, generaldesign, aerial design, variable selec-tivity, noise suppression and A.V.E.,tone control, servicing superhets withthe Cathode-ray tube, etc.
6/- net. (By post 6/6)
THE MATHEMATICSOF WIRELESS
By RALPH STRANGERThis brilliant and experienced writer
on Wireless makes even the mostabstruse topic interesting-and amus-ing ! The book deals with : Arith-metic, Algebra, Powers and Roots.Differential Calculus. Integral Calcu-lus. Trigonometry. The Slide Rule.Logarithms. Efficiency. Curves andGraphs in Wireless.
6/ -,net. (By post 6/6)Of all Booksellers, or by post from :
GEORGE NEWNES, LTD., (Book Dept.),Tower House, Southampton Street, Strand,
London, W.C.2.
Valuable Pocket BooksNEWNES ELECTRICAL
POCKET BOOK -(New and Enlarged Edition)
This handy pocket book containsa profusion of diagrams and sketchestogether with. graphs. It deals withAccumulators, A.C. Theory, BatteryCharging, Lighting, Magnetism,Motors, Rectifiers, Transmission,Switchgear, Water Heating, etc.
5/- net. (By post 5/6)
THE WELDINGENGINEER'S
POCKET BOOKContents :-Tables. Electric Arc Welding.The Electric Arc as a Maintenance Tool.Electric Arc Cast Iron Welding. Planninga Welding Shop. Electric Resistance Weld-ing. Resistance -welding Machines. Projec-tion Welding. Settings for ResistanceWelding. Seam Welding. Butt Welding.Electric Brazing. Automatic Welding. Oxy-acetylene Welding-Procedure for VariousMetals. Oxygen Cutting. Thermit Weld-ing. Protections for Welders. Testing byX -Rays. Other Methods of Testing.
5/- net. (By post 5/6)Of all Booksellers, or by post from :
GEORGE NEWNES, LTD., (Book Dept.),Tower House, Southampton Street, Strand,
London, W.C.2.
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PRACTICALWIRELESS
Edited by F. J. CAMM
6d. Every MONTH
Published by GEO. NEWNES, LTD.
THE LEADING WEEKLY FOR ALLENGINEERS
PRACTICALENGINEERINGEdited by F. J. CAMM
4d. Every THURSDAY
Published by GEO. NEWNES, LTD.