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 109
embers, which at once openin response to the force supplied by the spring of the contact members and auxiliary springsprovided for the purpose. Positiveness in opening is further assured by the blow of thearmature, which is added to the other opening forces; hence, the heavier the overload, themore…
Electrical engineering
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