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Henry, Joseph

Henry, Joseph

This article has been reviewed by the following Topic Editor: Peter Saundry

Joseph Henry (1797-1878), an American scientist, discovered the electromagnetic phenomenon of self-inductance. He also discovered mutual inductance, independently of Faraday, but Faraday was the first to publish his results. However, The SI unit of inductance, the henry, is named after him. His work on the electromagnetic relay was the basis of the electrical telegraph, jointly invented by Morse and Wheatstone. In 1846 Henry was named first Secretary of the newly established Smithsonian Institution. He was also a founding member of the National Academy of Sciences and served as its second President. For these accomplishments, Henry is widely considered to be among the foremost American scientists of the 19th century.

Further Reading
Induction and Inductance (NDT Education Resources)
Joseph Henry (Smithsonian Archives)
Self Inductance (Lecture Notes from Professor of Physics, Richard Fitzpatrick, University of Texas)

Citation

Cutler J. Cleveland (Lead Author);Peter Saundry (Topic Editor) "Henry, Joseph". In: Encyclopedia of Earth. Eds. Cutler J. Cleveland (Washington, D.C.: Environmental Information Coalition, National Council for Science and the Environment). [First published in the Encyclopedia of Earth September 7, 2006; Last revised Date September 7, 2006; Retrieved June 19, 2013 <http://www.eoearth.org/article/Henry,_Joseph>

The Author

Cutler J. Cleveland Cutler J. Cleveland  is Professor of Earth and Environment at Boston University, where he also is on the faculty of the Center for Energy and Environmental Studies. Professor Cleveland is Editor-in-Chief of the Encyclopedia of Energy (Elsevier, 2004), winner of an American Library Association award, the Dictionary of Energy (Elsevier, 2005), Handbook of Energy (Elsevier, forthcoming), and is the Founding Editor-in-Chief of the Encyclopedia of Earth.  He is the recipient of the Adelma ... (Full Bio)

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