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 550
is just entering the block near the relay both rails are atthe same pressure at that point because they are connected by thewheels and axles, which cuts out the relay and renders it inoperative,allowing the alternating current to flow full into the danger signal lamp.The drop in direct current is… … Fig. 3,731.—Rear view of Chicago time relay. A time relay is used when electrically controlledtime signals are required, such as line wire operated crossing bells. When current is sent intothe high resistance of the releasing magnet the armature is attracted, which allows the pen-dulum to swing…
Electrical engineering
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