File:Joseph Henry electromagnet closeup.jpg
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Summary
| Description |
English: A powerful electromagnet built by American scientist Joseph Henry around the 1830s. The electromagnet was invented by William Sturgeon in 1823, but Sturgeon's electromagnets were weak because without insulated wire he was only able to use a single spaced out layer of wire on iron cores. Henry created the first powerful electromagnets. By using wire insulated by silk he was able to make electromagnets with multilayer windings with thousands of turns like this one, which created strong magnetic fields which could lift thousands of pounds. According to the source text, this magnet was apparently overheated by passing excessive current through the windings, causing the charred areas. |
| Date | published 1900 |
| Source | Retrieved September 9, 2016 from Edward W. Byrn (1900) The Progress of Invention in the19th Century, Munn and Co., New York, p. 18, fig. 3 on Project Gutenberg |
| Author | Edward W. Byrn |
Licensing
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:10, 10 September 2016 | | 340 × 515 (62 KB) | wikimediacommons>Chetvorno | User created page with UploadWizard |
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