Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 36
Fig. 527.—Thompson galvanometer with mirror reflecting system for reading the deflectionsof a galvanometer needle by the movements of a spot of light reflected from a mirrorattached to the needle or movable magnetic system. Use of Mirrors in Galvanometers.—In order that smallcurrents may be…
Electrical engineering
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