J L Bacon & Co, London, manufacturers & installers, active ...

J L Bacon & Co, London, manufacturers & installers, active from c.1874

Natural ventilation of a theatre, Robert Boyle & Son, London & Glasgow, c.1900i

Screw fan, strap-driven from a steam engine, Useful Hints on Ventilation, W Walker, Manchester, 1850

Centrifugal fan driven by double enclosed steam engine,

Ventilation & Heating, Sturtevant, Boston & London, 1906

Perkin’s high pressure hot water boiler, Royal High School, Edinburgh, c.1900

Steel plate centrifugal fan with three-quarter housing on brick chamber,

Central Methodist Hall, London, 1911