Sketch of Henry Magnet
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Creator: Henry, Joseph 1797-1878
Form/Genre: Drawing
Date: 1857
Citation: Annual Report of the Board of Regents of the Smithsonian Institution Showing the Operations, Expenditures, and Condition of the Institution for the Year 1857, (Washington, DC: William A. Harris, Printer, 1858), 101
Sketch of Joseph Henry's magnet. Henry, first Secretary of the Smithsonian Institution, was the first to construct an electromagnet formed by tightly wrapping multiple coils of an insulated conducting wire around an iron bar. This technique improved upon the earlier work of William Sturgeon, increasing the magnetic power.
Historic Images of the Smithsonian
This image was scanned from page 101 of the Smithsonian Annual Report for 1857.
Annual Report of the Board of Regents of the Smithsonian Institution Showing the Operations, Expenditures, and Condition of the Institution for the Year 1857, (Washington, DC: William A. Harris, Printer, 1858), 101
Institutional History Division, Smithsonian Archives, 600 Maryland Avenue, SW, Washington, D.C. 20024-2520, SIHistory@si.edu
1857
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United States
SIA2012-7649
Number of Images: 1 ; Color: Black and White ; Size: 5.5w x 9h ; Type of Image: Drawing ; Medium: Paper