Elihu Thomson

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Born: 29 March 1853
Died: 13 March 1937

Early Life and Career

Elihu Thomson was born in Manchester, England, on 29 March 1853. His family moved to the United States in 1858, settling in Philadelphia, where he graduated from the Central High School early in 1870. He entered a laboratory as analyst, but was appointed assistant professor of chemistry at Central High School later in the same year. In 1876, when twenty-three years old, he was given the Chair of Chemistry in the same school. This position was retained until 1880, when, having become deeply interested in the future applications of electricity, he resigned to devote his entire time to electrical research.

Electric Company Accomplishments

Thomson's unusual inventive genius and marked ability to learn quickly were apparent even during his early years. His first important invention was the 3-coil are dynamo, which, with its automatic regulator and other novel features, was the basis of the successful electric lighting system produced by the company Thomson and a former high-school colleague, E. J. Houston, had established in Philadelphia in 1879 -the Thomson-Houston Electric Company. In 1892 the company merged with the Edison General Electric Company to become the General Electric Company. In the early years of the new company Thomson was elected chief engineer, producing many of the fundamental inventions upon which General Electric was based.

A Thomson-Houston Arc-Lighting Dynamo
Vibrating Lamp used by Elihu Thompson

As a record of Thomson's inventive work there are about six hundred patents in the United States alone, many of the inventions being of such importance that they have gone into extensive use in lighting, railways, power transmission, etc. The Thomson Electric Meter, as an example, which received first prize in a meter competition in Paris in 1890, is now numbered by millions in use. His pioneer discoveries and inventions in alternating currents are well known. It is not so well known that he is the inventor of the electric air drill as used today. Thomson was pioneer also in high frequency work, upon which in later years wireless methods have been based. He was the originator of the art of electric welding by the resistance method, a process which is being more and more extensively applied to metal manufactures, and which in fact is essential to many of them.

Awards and Legacy

The Edison Medal
Thomson was the first recipient of the Edison Medal, bestowed upon him in 1909 "For meritorious achievement in electrical science, engineering and arts as exemplified in his contributions thereto during the past thirty years."

Thomson was quite active in the American Institute of Electrical Engineers (AIEE), serving at various times as committeeman, and as vice president and president. He was president of the member of the Institution of Civil Engineers, London; Fellow of the American Academy of Arts and Sciences, Boston; member of American Philosophical Society, of the American Physical Society, Chemical Society and the National Academy of Science; and of many other societies in the United States and abroad. He was the recipient of many awards and honors. In 1889 he was decorated by the French Government for his electrical inventions, being made Chevalier et Officier de la Legion D'Honneur. He received the honorary degree of A.M. from Yale (1890). Tufts College in 1892 gave him the degree of Ph.D., and in 1899 he received a D.Sc. from Harvard. He was awarded the Rumford Medal in 1901, the Grind Prix at the Paris Expositions of 1899 and 1900, the Hughes Medal by the Royal Society of Great Britain for Experimental Researches in Electricity in 1916, and the John Fritz Medal also in 1916. He was president of the Massachusetts Institute of Technology from 1920 to 1923.

Thomson was married twice, first to Mary Louise Peck, in 1884. They had four children. After she died in 1916, he married Clarissa Hovey. He died at his home in Swampscott, Massachusetts, on 13 March 1937.

See also: Papers of Elihu Thomson