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 28
THE TELEPHONE 2,121 that the listeners ear placed close to the receiver cap readilyrecognizes the characteristics of the speakers voice. The use of the combination horse shoe permanent magnet,and electromagnet produces a very sensitive receiver. The Adler Bi-polar Receiver.—This receiver, which is… … ll u Li 2 Fig. 2,922.—Telephone bell box with door open. In construction, B is an induction coil con-sisting of two windings, the primary wound over the iron core and the secondary woundover the primary. A is the polarized bell and shows the two bell coils, and C is the con-denser. strengthen the…
Electrical engineering
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