Edison's filament lamp, 1879.

 
Edison's filament lamp, 1879.
4 0 c m
 
28cm
actual image size: 20cm x 32cm

Description

Made by the American inventor Thomas Alva Edison (1847-1931). Edison's lamp had a single loop of carbon which glowed when a current flowed through it. The glas bulb was evacuated so that there was so little oxygen in the bulb that the filament could get white hot without burning.

© Science Museum / Science & Society Picture Library

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