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 130
Figs. 3,069.—Bunnell spring contact breaker repeater as used for Weiny-Phillips repeater system. … Fig. 3,070.—Bunnell three spool differentially wound relay as used for Weiny-Phillips repeatersystem. The third spool of relay is differentially wound, so that normally the windingsneutralize each other and no magnetism is developed in this spool. One of the coils ofthe differential spool is in…
Electrical engineering
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