Joseph Henry, American Physicist #2
by Science Source
Title
Joseph Henry, American Physicist #2
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Science Source
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Photograph - Photograph
Description
Joseph Henry (December 17, 1797 - May 13, 1878) was an American scientist and served as the first Secretary of the Smithsonian Institution, and founding member of the National Institute for the Promotion of Science (precursor of the Smithsonian Institution). While building electromagnets, Henry discovered the electromagnetic phenomenon of self-inductance. The SI unit of inductance, the henry, is named in his honor. Henry's work on the electromagnetic relay was the basis of the electrical telegraph. Henry identified the room acoustics phenomena we now call direct sound, early reflections, and reverberation. Oil on canvas Daniel Huntington, 1857.
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May 25th, 2020
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