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File:Western Union standard galvanometer.jpg

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Summary

Description Drawing of tangent galvanometer from around 1890, made by J.H. Bunnel Co. Base 7 in. diameter. This was a type known as a 'Western Union standard'. It has 5 separate coils of resistance ~0, 1, 10, 50, and 150 ohms. The 7/8 in. compass needle in the center can have a silk fiber suspension.
Date
Source Downloaded from Lockwood, Thomas D. (1890) Electrical Measurement and the Galvanometer: It's construction and uses, 2nd Ed., J.H. Bunnel & Co., New York, p.36, fig.11 on Google Books
Author Thomas Dixon Lockwood
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.
United States
United States
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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current00:03, 11 December 2007Thumbnail for version as of 00:03, 11 December 2007738 × 818 (95 KB)Chetvorno{{Information |Description=Drawing of tangent galvanometer from around 1890, made by J.H. Bunnel Co. Base 7 in. diameter. This was a type known as a 'Western Union standard'. It has 5 separate coils of resistance ~0, 1, 10, 50, and 150 ohms. The 7/8

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