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 111
nsists essentially of a pivotedlever provided with a contact and adjusting screw, and carriedon a base having an insulated contact and a spring to keep thelever normally in the open position. A switch is provided toclose the circuit when the key is not in use. Ques. Explain its operation. Ans. .…
Electrical engineering
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