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| Keywords: Thompson mirror galvanometer use.png 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 http //www chss montclair edu/~pererat/mpersci htm 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 Downloaded from http //books google com/books id ZZ83AAAAMAAJ pg PA13 sig v31U_QMaInWIfs6Q2g7aSCtkHrQ Norman H Schneider 1913 Electrical Instruments and Testing Spon Chamberlain New York p 13 fig 8 and http //books google com/books id 2-sDAAAAQAAJ pg PA169 Thompson Silvanus P 1881 Elementary Lessons in Electricity and Magnetism Macmillan London p 169 fig 91 on Google Books and 1913 1881 Norman Hugh Schneider and Silvanus P Thompson Public domain - authors died more than 70 years ago thumb 100px left PD-old Mirror galvanometers History of technology Silvanus P Thompson | ||||
