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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lls of dry battery. The choke coil, whose core consists of a numberof soft-iron Avires projecting a couple of inches beyond the ends, iswound to -1 ohms, so that when the serrated metal ))late is scratchedby the spring controlled by the button on the left the discharge cur-rent Avill be of such volume as to produce a loud note in the receiverat the distant station. AVhen the two stations that ai-e communi-cating with each other aiv l)etween two telegra))h stations one bindingpost on the to^) of each box is connected to the telegraph line and the ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. 137 other grounded. When a telegraph station intervenes between the twotelephone stations the telegraph set must be bridged by a condenser. INSPECTION or ELECTRICAL INSTALLATIONS OF THE SIGNAL CORPS. It is required that inspections of the electrical installations of theSignal Corps be made at stated intervals. In the case of coast artil-lery posts these inspections are made annually, and for all other
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FRONT WITH DOOR REMOVEDInside of case should be mode to fit instruments andt may vary ve/y slightJy from dimensions given VERTICAL SECTION

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