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 548
sections to prevent the circuit being opened or closed with thepassing of each car. ELECTRIC RAILWAYS 2,639 bell circuits. Interlocking relay magnets are similar to double polarizedor neutral relay magnets. Time relay magnets consist of a single coilof wire. Signal Circuits.—On electric railways… … Fig. 3,729.—Glass enclosed interlocking relay; wall type with interlocking contact. Inter-locking relays are in reality a combination of two relays in one and are used in connectionwith two track circuits. The entire operation is actuated by gravity and without springs.Fig. 3,734 shows the…
Electrical engineering
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