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 117
2.210 HAWKINS ELECTRICITY … Ques. De-scribe a sim-ple short linewith relays.* Ans. Asshown in fig.3,056, it con-sists of onemain circuitand an auxil-iary circuit ateach station.The main cir-cuit includesthe relays,keys, andmain cells allconnected inseries withground return.The auxiliarycircuit at eachstation is madeup of a…
Electrical engineering
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