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 134
ack stops in accordance with those changes. THE TELEGRAPH 2,227 and the other consisting of resistance coils having a resistance,equivalent to that of the line and known as the artifiicial line.The key and battery at each station are common to both cir-cuits, the points of divergence being at the… … Fig. 3,075.—The Stearns differential duplex telegraph system. The equipment for eachstation consists of a key, transmitter, differential relay, sounder, rheostats, condenser,retardation coil, batteries and connections as shown. The batteries B and B contain thesame number of cell. The lever of the…
Electrical engineering
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