Edison's light bulb patent. Printed patent drawings,dated 27th January 1880,of the electric lamp design by US inventor Thomas A. Edison (1847-1931). This incandescent light bulb design had been developed by Edison in November 1879. Light was produced by passing an electric current through a coiled carbon filament (bottom),which was placed inside a glass bulb (top). Although others had developed similar light bulbs,Edison's design was the first long-lasting filament. This was patent number 223,898 issued by the US Patent Office. Edison's signature is at lower right | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / US National Archives And Records Administration |
Bildgröße: | 2333 px × 3416 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |