Joseph Henry

Joseph Henry (December 17 1797 – May 13 1878) was an American scientist. During his lifetime, he was considered the greatest American scientist since Benjamin Franklin. 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.

Career

• 1826 - Professor of Mathematics and Natural Philosophy at Albany Academy, New York.
• 1832 - Professor at Princeton.
• 1835 - invents the electromechanical relay.
• 1846 - First secretary of the Smithsonian Institution, who contended with the notorious antics of the Megatherium Club.
• Second president of National Academy of Sciences.