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
Fig. 24. Pole Changing Transmitter (B & O Pattern) Courtesy of J. H. Bunnell & Company … Fig. 25. Standard Polarized RelayCourtesy of J. II. Bunnell & Company desirable to subs-titute for the manually-operated open circuit typekey, a magneticady-operated single-pole transmitter which reducesto a minimum the nterval of time during which the line connectionis being changed from…
Electrical engineering
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