Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 198
ion of the mirror; thedeflections of the spot of lighton the scale, however, arepractically proportional to thestrength of currents through the instrument. When a telescope issubstituted for the lamp, as in Fig. 164, a dark room is not required. The scale readings are reflectedin the mirror and… … Fig. 164.—DArsonval Mirror-Reflecting Galva-nometer with Scale and Reading Telescope.
Electricity · Magnetism
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