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 302
and make changes in the annunciator connec-tions accordingly, in case of error. ELECTRIC BELLS 2,393 Elevator Installations.—All passenger and freight eleva-tors should be fitted with electric bells and annunciators. Andall dumb waiters should be announced by electric buzzers asthey are brought up… … Fig. 3,288.—Western Electric return or fire call annunciator system. It employs two bat-teries and two return wires. Battery A, is for the annunciator circuit, and battery B,for the return or fire call circuit. The pushes are of the three point type, and in each roomtheir top contacts and push…
Electrical engineering
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