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.
Image Details
Image Ref.
10315472
© Science Museum / Science & Society Picture Library