File:Thomson mirror galvanometer.jpg

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Description Drawing of a Thomson reflecting galvanometer from around 1900. Tom Perera's Scientific instrument collection says it was Model 502, made by Elliot Bros., London. The vertical tube contains a fine silk fiber, which suspends a 1/2 in. mirror with small magnets on its back, seen in window, in the center of a coil of wire. A light beam reflected from the mirror lands on a scale and serves as a pointer. It has interchangeable coils of from 150 to 5000 ohms resistance. Alterations: removed caption, rotated image so it was vertical.
Date
Source Downloaded from Norman H. Schneider (1913) Electrical Instruments and Testing, Spon & Chamberlain, New York, p.13 fig.8 on Google Books
Author Norman Hugh Schneider
Permission
(Reusing this file)		 Public domain - published in USA 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.
United States
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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Date/TimeThumbnailDimensionsUserComment
current18:26, 11 December 2007Thumbnail for version as of 18:26, 11 December 2007526 × 1,030 (34 KB)wikimediacommons>Chetvorno{{Information |Description=Drawing of a Thompson reflecting galvanometer |Source=Downloaded from [http://books.google.com/books?id=ZZ83AAAAMAAJ&pg=PA13&sig=v31U_QMaInWIfs6Q2g7aSCtkHrQ Norman H. Schneider (1913) ''Electrical Instruments and Testing'', Spon

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