Joseph Henry

Joseph Henry  (December 17, 1797 – May 13, 1878) was an American scientist who served as the first Secretary of the Smithsonian Institution. He was the secretary for the National Institute for the Promotion of Science, a previous form of the Smithsonian Institution. While building electromagnets, Henry discovered electromagnetism, He also discovered mutual inductance independently of Michael Faraday though Faraday was the first to make the discovery and publish his results. Henry also developed the electromagnet into a practical device. Among his inventions was the electric  doorbell (specifically a bell that could be rung at a distance via an electric wire, invented in 1831) and the electric relay (1835).

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Category:1797 births
Category:1878 deaths
Category:American physicists
Category:Scientists from Albany, New York