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 57
therefore operatesthe relay. It is of course neces-sary that incoming signals be notinterrupted by the operation ofthe home key, therefore a doublecontact key is necessary to groundthe circuit directly when the bat-tery is not in the circuit. Thisis the same as the key used in theopen circuit… … Fig. 24. Pole Changing Transmitter (B & O Pattern) Courtesy of J. H. Bunnell & Company
Electrical engineering
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