Joseph Henry
Joseph Henry (
December 17 1797 May 13 1878) was an American scientist. While building electromagnets, he discovered the
electromagnetic phenomenon of self-
inductance. He also discovered mutual inductance, independently of
Faraday, but Faraday was the first to publish his results. His work on the electromagnetic relay was the basis of the
electrical telegraph, jointly invented by
Morse and
Wheatstone.
The SI unit of inductance, the henry, is named after him.
Career