Thomas Edison

Thomas Edison

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Edison, Thomas Alva, 1847?1931, American inventor, b. Milan, Ohio. A genius in the practical application of scientific principles, Edison was one of the greatest and most productive inventors of his time, but his formal schooling was limited to three months in Port Huron, Mich., in 1854. For several years he was a newsboy on the Grand Trunk RR, and it was during this period that he began to suffer from deafness, which was to increase throughout his life. He later worked as a telegraph operator in various cities.

Edisons first inventions were the transmitter and receiver for the automatic telegraph, the quadruplex system of transmitting four simultaneous messages, and an improved stock-ticker system. In 1877 he invented the carbon telephone transmitter (see microphone) for the Western Union Telegraph Company. His phonograph (patented 1878) was notable as the first successful instrument of its kind.

In 1879, Edison created the first commercially practical incandescent lamp (with a carbon filament). For use with it he developed a complete electrical distribution system for light and power, including generators, motors, light sockets with the Edison base, junction boxes, safety fuses, underground conductors, and other devices. The crowning achievement of his work in this field was the Pearl

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