Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 260
Fig. 408.—Connections for an electrically operated track switch. The magnets are ener-gized by inserting them between the trolley wire and the trolley wheel. By passing the insu-lated section of the trolley with the power on or off, the track magnet can be energized or leftdead, respectively.…
Electric wiring
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