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Henry, Joseph (1797–1878)




Joseph Henry
American physicist best known for his electromagnetic studies. His discoveries include induction and self-induction; though in both cases Michael Faraday published first. He also devised a much improved electromagnet by insulating the wire rather than the core; invented one of the first electric motors; helped Samuel Morse and Charles Wheatstone devise their telegraphs; and found sunspots to be cooler than the surrounding photosphere. The henry is named after him.


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