International Library of Technology · Scranton, International Textbook Co. · leaf 705
erent floors. The returnwires from each button are then carriedto a point a at the middle of the shaft,where they should terminate in a smallconnection board, so that they may bereadily disconnected from the wires in thecable running to the cage e. The wiresrunning from the connection board to the… … therereturn 38 INTERIOR WIRING. 28 SPECIAL APPLIANCES. 52. The Automatic Drop.—For special alarm purposes,it is sometimes desirable that the bell should continue toring after the push is released. This is accomplished by theuse of an automatic drop, which closes an extra, or shunt,circuit as soon…
Electrical engineering
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