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 85
unicating. 1,604 HAWKIXS ELECTRICITY Ques. What is an oil switch? Ans. One in which the contact is broken under oil. This type of switch is the one almost universally used on high pres-sure alternating current circuits, because ot the fact that the oil tendsto cause the current to break when at its… … SWITCH Fig. 2.227.—Kelman electric control unit for oil switch. It consists of an iron frame whichcontains the opening and closing coils and the bearings for the operating be11^ crank.A small switch on the frame automatically opens the coil circuit at the end of the strokein either direction and…
Electrical engineering
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