File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14733515846).jpg

Identifier: electricalinstru00unitrich (find matches)
Title: Electrical instruments and telephones of the U.S. Signal corps
Year: 1911 (1910s)
Authors: United States. Army. Signal Corps
Subjects: Military telegraph -- United States Military telephone -- United States
Publisher: Washington, Govt. print. off.
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN

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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 35 is a theoretical diagram of the connections of the Millikenrepeater. R and R are the main-line relays. EM and EM areextra magnets, which, in practice, are supported on metal standards The descriptions and diagrams of the Milliljen and Weiny-Phillips repeatersare taken by permission from Mavers American Telegraphy. 70 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. that hold them ii«ridly in their respective positions rehitive to themain-line relays. The armature levers of the extra relays are pivotedat the top as shown. T and T are transmitters. The levers L L oithe transmitters are insulated from the ton^rues ,/• ,/ at points i Vand from screw posts F F by small pieces of hard rubber. :a-Hi
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^ 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 latterinstrument opens, it first breaks the local circuit of KM at a : theretractile spring S of extra magnet EM at once jjulls its lever againstthe lever / of relay R as in figure: presently the transmitter T opens ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. 71 the western circuit at x; this demagnetizes relay h\ and its springwould withdraw its lever I from its front stop /, thereb)^ opening thetransmitter 7, and consequently the eastern circuit at .r. Init that, asalready said, the lever of KM is against lever 7, holding it on its frontstop, and thus keeping the local circuit of 7 closed. When the eastagain closes his key, relay /? also closes: conseciuently so does T.This action closes /iW, and the l

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