File:Thompson reflecting galvanometer.jpg
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| Description | Thompson reflecting galvanometer with 2 coils, from around 1900. The small mirror, center, and the two small magnets in the center of the two helical coils, are suspended by a delicate fiber. In operation, the door is closed, and a light beam shining through the window and reflecting off the mirror onto a separate scale, serves as the pointer. The current to be measured passes through the coils and deflects the magnets and mirror. There are two magnets and two coil assemblies, with the magnets' N poles pointed in opposite directions, to cancel out the Earth's magnetic field. This design is called an astatic galvanometer. Alterations: removed caption. |
| Date | |
| Source | Downloaded from Norman H. Schneider (1913) Electrical Instruments and Testing, 4th Ed., Spon & Chamberlain, New York, p.15, fig.9 on Google Books |
| Author | Norman H. Schneider |
| Permission (Reusing this file) |
Public domain - published in US before 1923 |
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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 | 04:19, 11 December 2007 | | 714 × 934 (78 KB) | Chetvorno (talk | contribs) | {{Information |Description= |Source=Downloaded from [http://books.google.com/books?id=IfoOAAAAYAAJ&pg=PA15 Norman H. Schneider (1913) ''Electrical Instruments and Testing, 4th Ed.'', Spon & Chamberlain, New York, p.15, fig.9] on Google Books |Date=1913 |A |
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