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Gramme Swan

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Thomas Alva Edison


Milan (Ohio) 11.February.1847- West Orange (New Jersey) 18.October.1931)
1878 Lamp electrical

In 1876 it creates the laboratory of Menlo Park, still today working. After two years from this creation it was dedicated to the problem of the light,  already was begun the search in Europe in this field, in  the 1860  Swan was already successful to construct to a light bulb electrical worker having for filament a coal strip, but its duration was too much short. Edison resolved the problem in practical way carbonating    a bamboo  filament    obtained    a extended life of the lamp, thanks also to the improvement of the pumps to high empty that were available in 1878. Edison realized its lamp electrical worker 21 October 1879, after two months illuminated the roads of the city of Menlo Park.