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
Fig. 3,068.—Bunnell tongue contact repeater as used for Milliken repeater system. Dup-licate connections are made at and between the special relay and repeater or sounderhere shown and consequently the relay operates the repeater and produces the loud soundfrom which the signals are read. THE… … Figs. 3,069.—Bunnell spring contact breaker repeater as used for Weiny-Phillips repeater system.
Electrical engineering
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