Edison Incandescent Electric Lamp Patent, 1882

Numéro d’image : 12653068
Edison Incandescent Electric Lamp Patent, 1882
Thomas Edison's Incandescent Electric Lamp Patent. Edison began research into developing a practical incandescent lamp in 1878. He filed his first patent application for Improvement In Electric Lights in October 1878. After many experiments, first with carbon in the early 1880s and then with platinum and other metals, in the end Edison returned to a carbon filament. The first successful test was on October 22, 1879, and lasted 13.5 hours. Edison continued to improve this design and by November 4, 1879, filed for a US patent for an electric lamp using a carbon filament or strip coiled and connected to platina contact wires. This image has been colorized.
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Crédit: Science Photo Library / Science Source
Taille de l’image : 2999 px × 4650 px
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