File:Sturgeon_electromagnet.png
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Sturgeon_electromagnet.png (422 × 600像素,文件大小:32 KB,MIME类型:image/png)
摘要
描述Sturgeon electromagnet.png |
English: Drawing of the first electromagnet, invented in 1824 by British scientist William Sturgeon. This was his original drawing from his 1824 paper to the British Royal Society of Arts, Manufactures, and Commerce. It was made of 18 turns of bare copper wire (insulated wire had not been invented) on a U-shaped lacquered iron core about 1 ft (30 cm) long and 1/2 inch (13 mm) diameter. When the wires were connected to a single cell copper-zinc-acid battery, the electromagnet could support 9 pounds. The little cups contain mercury and were an early method of making an electrical contact between wires. The one on the left acts as a power switch. Alterations to image: converted from JPG to 32color PNG. (Detailed information is from Sylvanus P. Thompson (1891) Lectures on the Electromagnet, W.J. Johnson Co., New York, p.17-19) |
日期 | |
来源 | Downloaded August 9, 2008 from Joseph Henry's contributions to the Electromagnet, Smithsonian Institution Archives, neg. no. 46,761-D, where it is credited to Sturgeon, W. (1824) 'Improved Electro Magnetic Apparatus', Trans. Royal Society of Arts, Manufactures, and Commerce, Vol.43, Plate 3, fig.13. |
作者 | William Sturgeon |
授权 (二次使用本文件) |
Public domain - Author died 1850 |
许可协议
Public domainPublic domainfalsefalse |
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本作品在其来源国以及其他著作权期限是作者逝世后70年或以下的国家和地区属于公有领域。 ![]() |
本文件已被确认为免除已知的著作权法限制(包括所有相关权利)。 |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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当前 | 2008年8月9日 (六) 20:24 | ![]() | 422 × 600(32 KB) | Chetvorno | {{Information |Description={{en|Drawing of first Wikipedia:electromagnet invented in 1824 by British scientist William Sturgeon. It was made of 18 turns of copper wire on an iron core. This is Sturgeon's original drawing from his paper to the Britis |
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