4 0 c m
33cm
actual image size: 25cm 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 contained a partial vacuum; there was so little oxygen in the bulb that the filament could get very hot without catching fire.
Image Details
Image Ref.
10319843
© Science Museum / Science & Society Picture Library