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), 1833-1928 · New York : T. Audel & Co. · leaf 493
tance is automatically short circuited by a switchgoverned by a float. To cut in the resistance the liquid is depressed byair pressure. Ques. Describe the changeable pole method. Ans. In this method the number of pole may be altered to 2,584 HAWKINS ELECTRICITY secure variable torque either by… … Fig. 3,637.—Westinghouse cylinder and magnet valve cut to show working parts. In operating the reaction of the spring, when compressed by the admission of air to the cylinder, is 12(1pounds and the leverage is such that the pressure of 100 pounds appears at the switch jawsfor forcing them apart.…
Electrical engineering
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