Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 35
such aninstrument. The moving mirrorleflects an image of the scale intothe objective of the telescope.Continuous work with the tele-scope is apt to injure the eyes, and is certainly tiresome. Where much gal-vanometer work is being done by the same person, a ray of light from asmall electric, gas,… … Fig. 12. — Thomson Reflecting AstaticGalvanometer with Four Coils GALVANOMETERS. 23
Electrical engineering
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