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 111
SPRING … Figs. 2,259 to 2,262.—Elementary diagrams illustrating the various methods of electro-magnetic control for circuit breakers. Fig. 2,259, overload trip; fig. 2,260, underload trip,fig. 2,261, low voltage trip; fig. 2,262, control from auxiliary circuit by means of a relay. CURRENT AND PRESSURE…
Electrical engineering
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