Incandescent electric lamp, carbon filament, 16 candle power, 100 volts, Edison Swan Electric Co. Ltd

Arc lamp carbon rod, pair, South Foreland Lighthouse, Kent, 1875 - 1928

Brush Vienna incandescent electric lamp, carbon filament, 3 1/2 watt 100 volt, late 19th - early 20th century

Model of carbon filament incandescent electric lamp, earliest successful form, made by Sir Joseph Swan and exhibited in Newcastle in 1878, model made by Fred Topham (employee), late 19th - early 20th century

Incandescent electric lamp, looped carbon filament supported from side of bulb, late 19th - early 20th century

Sunbeam incandescent electric lamp, 105 volts 16 candlepower, looped filament of tar and carbon, made by Sir Charles Parsons and Co., c. 1895

Electric lamp with double loop carbon filament and spherical bulb made by the Swan United Electric Light Co. Ltd

Vacuum incandescent electric lamp, with cord switch on bayonet cap to short circuit one of two carbon filaments allowing bright and dim

Vacuum incandescent electric lamp, with cord switch on bayonet cap to short circuit one of two carbon filaments allowing bright and dim

Three carbon filament electric lamps, 115 volt 3 1/2 watt, Brush Vienna, 1st half 20th century

Incandescent electric lamp, carbon filament, marked Scott, 1st half 20th century

Serrin-type electric arc lamp, No. 8, for the Isle of May Lighthouse, removed from service in 1924, by A. de Meritens and Cie, Paris, 1886

Johnson's carbon pencil telephone transmitter in wooden case with terminal connections, invented by W. Johnson, Sheffield, 1880

Solid back telephone transmitter with clear mica front cover, in wooden case with terminal connections, c. 1890

Hughes microphone with carbon pencil poised between rigid and flexibly-mounted carbon blocks, each block marked S, the flexible mounting a shield-shaped piece of thin veneer suspended from brass brackets on two wood baluster supports, on wood base with two terminals, c. 1879

'Female' VERT rotor, black 25% carbon, with inscription, designed by VERT Rotors UK Ltd, 2015 - 2016