International Library of Technology · Scranton, International Textbook Co. · leaf 706
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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