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 94
he bell.This makes it impossible for anydirect current to pass from one sideof the line to the other, so long as the receiver is upon the hook.But if the operator at central wishes to call up the subscriber, shehas only to throw upon the line an alternating current from the mag-neto M, or from any… … Fig. Sectional View of ModernTransmitter.
Electrical engineering
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