Joseph Henry
American scientist and the 1st Secretary of the Smithsonian (1797-1878)
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The SI unit stamped on every inductor — the henry — belongs to the physicist who made electromagnets work and invented the relay that let telegraphs talk across continents, then spent three decades running the Smithsonian instead of chasing more credit.
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Joseph Henry was born December 17, 1797, and built his name winding electromagnets in the 1820s and early '30s. While doing that work he discovered self-inductance, the property that makes a coil resist changes in its own current, and independently found mutual inductance around the same time Faraday did — though Faraday published first. Henry turned the electromagnet from curiosity into tool, invented a bell that rang at a distance via electric wire in 1831, and in 1835 built the electric relay, the switch that made long-distance telegraphy possible for Morse and Wheatstone. In 1846 he became…
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- WikidataHigh confidencewikidata · wikidata.org
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