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 279
Figs. 2,520 to 2,526.—Various types of Wagner instruments. Fig. 2,520, small round type;fig. 2.521, horizontal edgewise type; fig. 2,522, smallest switchboard type; fig. 2.523, port-able type; fig. 2,524, combination voltmeter and ammeter in one case; fig. 2,525, verticaltype; fig. 2,526, polyphase…
Electrical engineering
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