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Thomas Edison

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Edison was born in 1847 in the canal town of Milan, Ohio, the last of seven children. His mother, Nancy, had been a school teacher; his father, Samuel, was a Canadian political firebrand who was exiled from his country. The family moved to Port Huron, Michigan, when Thomas was seven. He attended school briefly but was principally educated at home by his mother and in his father's library.

In 1859 Edison began working on a local branch of the Grand Trunk Railroad, selling newspapers, magazines, and candy. At one point he printed a newspaper on the train, and he also conducted chemical experiments in a baggage-car laboratory. By 1862 he had learned enough telegraphy to be employed as an operator in a local office.

From 1863 to 1867 he traveled through the Midwest as an itinerant telegrapher. During these years he read widely, studied and experimented with telegraph technology, and generally acquainted himself with electrical science.

Early Inventive Career

In 1868 Edison became an independent inventor in Boston. Moving to New York the next year, he undertook inventive work for major telegraph companies. With money from those contracts he established a series of manufacturing shops in Newark, New Jersey, where he also employed experimental machinists to assist in his inventive work.

Edison soon acquired a reputation as a first-rank inventor. His work included stock tickers, fire alarms, methods of sending simultaneous messages on one wire, and an electrochemical telegraph to send messages by automatic machinery. The crowning achievement of this period was the quadruplex telegraph, which sent two messages simultaneously in each direction on one wire.

The problems of interfering signals in multiple telegraphy and high speed in automatic transmission forced Edison to extend his study of electromagnetism and chemistry. As a result, he introduced electrical

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