By Karen Salazar. EARLY FORMS OF TIME- TELLING The Sun Sun-Dial.

By Karen Salazar

MANUFACTURING PROCESS OF

WATCHES

EARLY FORMS OF TIME-TELLING

The Sun Sun-Dial

WRIST WATCHES

• Small pocket watches, two to three inches in diameter, were available by the end of the nineteenth century.

• Mechanical wristwatches were an everyday item in the United States by the 1960s.

INVENTION OF THE “MICROCHIP”

• Microchip technology with quartz crystals

• Microchip is used to send signals to the dial of the watch

• Advantage: not a mechanical device w/ moving parts = does not wear out

QUARTZ

• A quartz watch uses the electricity from a piece of quartz from a battery

RAW MATERIALS

• Made of modern materials; plastics and alloy metals

• Cases can be made of either plastic or metal

• Microchips: made of silicon

• LED: made of gallium arsenide

CITATIONS

http://bmwi.bimmerpost.com/forums/showthread.php?t=891519

http://www.madehow.com/Volume-1/Watch.html