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Thomas Alva Edison

Edison's 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 St. plant (1881–82) in New York City, the first permanent central electric-light power plant in the world. He also built and operated (1880) an experimental electric railroad, and produced a superior storage battery of iron and nickel with an alkaline electrolyte.

SourcesBrown, Terry. Thomas Edison: the Wizard of Menlo Park. New York: Harper, 2007."Thomas Edison: he changed the world." Edison Institute 2005. (Accessed 4/4/10).Third Source. Publication information including year.Mrs. Stifel


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