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 135
wire. Thompson astaticinstruments can be provided with polarity indicators, a reddisc showing on the scale card where the ooles are reversed. 554 HAWKINS ELECTRICITY The effect of external fields is eliminated by the astaticarrangement of the fields and the moving parts. A field whichtends to… … Fig. 643.—Portable multiplier for portable voltmeter. A multiplier is used for increasing thereadings of voltmeters, and consists of resis.ance coils placed in a portable case. A mul-tiplier is connected in series vrith the voltmeter and must be adjusted for the instrumentwith which it is to be…
Electrical engineering
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