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 296
Fig. 3,278.—Parallel circuit connections for ringing two bells from cither one or two pushes. are most extensively used in connection with elevator, office,hotel, and residence call bell service. The mechanism of anannunciator consists of an arrangement of electromagnets theenergizing of which,…
Electrical engineering
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