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 201
duty circuits aredesigned to rupture the arc as soon as formed. … Fig. 1,042.—Diagram showing operation of variable gap arc breaker used on heavy duty light-ning arresters. When a lightning discharge passes across the gap to earth, the dynamocurrent follows it and energizes the magnet M, which attracts the short arm of the doublelever, thus quickly jerking the…
Electrical engineering
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