Edison's light bulb patent, 1880

Numéro d’image : 12645075
Edison's light bulb patent, 1880
Edison's light bulb patent, 1880. Printed patent drawings of the electric lamp design by US inventor Thomas Alva 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 is patent number 223, 898 from the US Patent Office, dated 27 January 1880.
Licence : Droits gérés
Crédit: Science Photo Library / US National Archives And Records Administration
Taille de l’image : 4912 px × 7181 px
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