Electrical instruments and telephones of the U.S. Signal corps (1911)
United States. Army. Signal Corps · Washington, Govt. print. off. · leaf 73
rd repeater of the principal telegraphcompanies of this country. This repeater may perhaps be termed an automatic electro-mechan-ical repeater, for, while electricity is the controlling force in the per-formance of its automatic functions, the ultimate action is mechanical,as will be seen. Figure… … ^ lIlIlI^- ^-Hi The workinor of this repeater may perhaps be best described byassumiiiii- that the east is about to send. To that end he opens his key;that opens relay R and its lever V falls back, as in the ficrure, andopens the local circuit. controllin<r the transmitter T. As the…
Military telegraph -- United States · Military telephone -- United States
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