Edison's light bulb patent,1880

Numéro d’image : 11904717
Edison's light bulb patent,1880
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
Licence : Droits gérés
Crédit: Science Photo Library / US National Archives And Records Administration
Taille de l’image : 2333 px × 3416 px
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