Joseph Henry Electromagnet Equipment - Telegraph Sounder
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Henry, Joseph 1797-1878
Joseph Henry was an American scientist who served as the first Secretary of the Smithsonian Institution. He discovered the electromagnetic phenomenon of self-inductance (SI).
Smithsonian Institution Archives, Record Unit 95, Box 27C, Image No. SIA_000095_B27C_022
Smithsonian Institution Archives Capital Gallery, Suite 3000, MRC 507; 600 Maryland Avenue, SW; Washington, DC 20024-2520
SIA RU000095 [SIA_000095_B27C_022]
4 x 7;