24 nov 1879 anni - Invention of light bulb

Descrizione:

Joseph Swan and Thomas Edison both patent a functional incandescent light bulb. Some two dozen inventors had experimented with electric incandescent lighting over the first three-quarters of the 19th century but never came up with a practical design. Swan's, which he had been working on since the 1860s, had a low resistance so was only suited for small installations. Edison designed a high-resistance bulb as part of a large-scale commercial electric lighting utility

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