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.[1] 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.[2][3][4] 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)[5] and the electric relay (1835).[6]
Joseph Henry | |
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| 1st Secretary of the Smithsonian Institution | |
| In office 1846–1878 | |
| Succeeded by | Spencer Fullerton Baird |
| 2nd President of the National Academy of Sciences | |
| In office 1868–1879 | |
| Preceded by | Alexander Dallas Bache |
| Succeeded by | William Barton Rogers |
| Personal details | |
| Born | December 17, 1797 Albany, New York, U.S. |
| Died | May 13, 1878 (aged 80) Washington, D.C., U.S. |
| Nationality | American |
| Spouse(s) | Harriet Henry (née Alexander) |
| Children | William Alexander (1832–1862) Mary Anna (1834–1903) Helen Louisa (1836–1912) Caroline (1839–1920) |
| Alma mater | The Albany Academy |
| Known for | Electromagnetic induction, Inventor of a precursor to the electric doorbell and electric relay |
| Scientific career | |
| Fields | Physics |
| Institutions | The Albany Academy The College of New Jersey Smithsonian Institution Columbian College |
References
- "Planning a National Museum". Smithsonian Institution Archives. Archived from the original on 3 August 2009. Retrieved 2 January 2010.
- "A Brief History of Electromagnetism" (PDF).
- Ulaby, Fawwaz (2001-01-31). Fundamentals of Applied Electromagnetics (2nd ed.). Prentice Hall. p. 232. ISBN 978-0-13-032931-8.
- "Joseph Henry". Distinguished Members Gallery, National Academy of Sciences. Archived from the original on 2006-12-09. Retrieved 2006-11-30.
- Scientific writings of Joseph Henry, Volume 30, Issue 2. Smithsonian Institution. 1886. p. 434. ISBN 9780598400116.
- "The electromechanical relay of Joseph Henry". Georgi Dalakov. 4 January 2021.
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inductance.
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