File:Thompson mirror galvanometer use.png

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Summary

DescriptionThompson mirror galvanometer use.png	English: Drawing of a Thomson reflecting galvanometer from around 1880, showing use. 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. Tom Perera's Scientific instrument collection says this was a Model 502, made by Elliot Bros., London. It has interchangeable coils of from 150 to 5000 ohms resistance. The left drawing is from Schneider, the right from Thompson. Alterations: removed captions, rotated Schneider image so it was vertical, scaled Thompson image by 0.60, combined images. Nederlands: Tekening van een Thomson spiegelgalvanometer van ongeveer 1880.
Date	1913 and 1881
Source	Downloaded from Norman H. Schneider (1913) Electrical Instruments and Testing, Spon & Chamberlain, New York, p.13 fig.8 and Thompson, Silvanus P. (1881) Elementary Lessons in Electricity and Magnetism, Macmillan, London, p.169, fig.91 on Google Books
Author	Norman Hugh Schneider and Silvanus P. Thompson
Permission (Reusing this file)	Public domain - authors died more than 70 years ago
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	Date/Time	Thumbnail	Dimensions	User	Comment
current	00:41, 13 December 2007		1,215 × 614 (65 KB)	wikimediacommons>Chetvorno	== Summary == {{Information \|Description=Drawing of a Thompson reflecting galvanometer from around 1900. 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

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