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 551
signaling wherethe railroad uses direct current for propulsion and alternating currentfor signal operation, by the use of balanced inductive bonds connectedacross the rail insulations at the ends of the blocks. This double railcircuit is a feature of the signaling operation of the New York,… … Fig, 3,732.—A method of frog bonding. There are many good foremen in charge of construc-tion forces bonding frogs, but there are no two who have the same ideas as to the bestmethod. It is the custom to put the holes in the rail where it is most convenient and toput the channel pins on the side on…
Electrical engineering
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