Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 78
New YorkKey_ Local. Battery Earfh Fig. 66. … Diagram of Arrangement of Parts in a Telegraphic Systembetween Chicago and New York. current in the main line simply serves to close and open the circuitin the local battery which operates the sounder (see Fig. 66). Theelectromagnets of the relay and the sounder differ in that the formerconsists of…
Electrical engineering
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