Edison screw-in bulb, c 1880.

Edison screw-in bulb, c 1880.
3 1 c m
40cm
actual image size: 32cm x 23cm

Description

The Edison screw-in bulb was the first light bulb to be manufactured on a large scale. In sending a current to heat a filament, and thus produce light, the Edison screw-in bulb worked like any other bulb. What made it stand out, was Thomas Edison's (1847- 1931) determination to produce a bulb capable of heating a room for weeks. Edison also worked hard on how to create a vacuum within the bulb, and therefore increase its burning capacity. By 1879, he had made pumps which could achieve a vacuum a millionth of standard atmospheric presure.

© Science Museum / Science & Society Picture Library

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