Joseph Henry Demonstrates His First Telegraphic Apparatus, a Bell-Ringer
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Date: 1831-1832
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For his students at Albany Academy, Joseph Henry uses a battery and electromagnet to transmit a current through a 1,060-foot wire, causing a bar magnet suspended on a pivot to strike a bell.
Chronology of Smithsonian History
Institutional History Division, Smithsonian Institution Archives, 600 Maryland Avenue, SW, Washington, D.C. 20024-2520, SIHistory@si.edu
1831-1832
Albany (N.Y.)