Thomas Edison,American inventor

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Thomas Edison,American inventor
Thomas Alva Edison (1847-1931),American inventor. Despite receiving little formal education,Edison filed over 1000 patents during his life,more than any other inventor. His first commercial success came with a stock ticker for a Wall Street firm. This provided him with the funds to set up his own research company. Here he devised the phonograph (for recording sound) and the light bulb,amongst other inventions. During work on the light bulb he discovered the Edison Effect: a current flows from a hot filament to an electrode,but not the other way around. This formed the basis of the ther- mionic valve. He was awarded the John Fritz medal
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