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
ter and represents a distinct ad\ance in the art. 62 MODERN LAND AND SUBMARINE TELEGRAPHY 53 It is now in operation dnplexcd on several lines of the Postal Tele-graph Company, the Western Union Telegraph Company, andseveral railroads. Six unit time intervals of current are used in transmission… … Fig. 32. Morkrum Telegraph Keyboard TransmitterCourtesy of Morkrum Company Mctluxl of Signaling. The wiring diagram for the complete cir-cuit is shown in Fig. 33. Normally negative current is on the line.Signals are sent by reversals of polarity, the line impulses varying inlength by full units.…
Electrical engineering
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