File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14570118147).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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ection for magneto switchboards is usually installed sepa-rate from them; in most cases on the wall near by and within sight ofthe operator. A cabinet of the same wood and finish as the switch-board is provided for the installation of the necessary number ofMason arresters. The connections between the switchboard and the protector cabinetshould be made bv means of 20-pair cable, rubber insulated, withcode color braid. Over the entire cable is a waterproof covering forprotection and insulation. The color scheme is similar to that givenfor switchboard installation and should be carefully followed, asstated therein. The foniis for both the switchboard and protector ends should becarefully laced, each wire being brought out at its particular linespring ()!• arrester. The switchboard end should be carefully solderedafter the wire is passed through the hole and wrapped around thespring. The forms should be shellacked when completed, but never ELECTKICAL IKSTKUMENTS U. S. SIGNAL CORPS. 173
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174 ELECTRICAL INSTRUMENTS IT. S, SIGNAL CORPS. boiled in hce.swax. whicli injures ruhhcr in^-iilntion. Il is lie-t lo runtlie line cable under ibe floor, runninii- down tlirouiih the bottom ofswitchboard and coniiiii>- u)) directly under the i)oint of arrestercabinet it is desired to enter, protectiuii- it with loricated conduit l)e-tweeii the floor and cabinet, and nndei the flooi proxi-ion ^houhl l>emade to protect the cable frcun moisture. The outside lines shouM always be brought into the office andcal)inet in cal)le. even though tlie length of cable is short. If overIi ))air in size tliis cable will necessarily be paper insulated with leadsheiith, and shouhl be potheade(l at both ends to terminate the con-ductors in rubf)er insulation. The methods of potheading will bedescribed in another chapter. The pothead sleeve should be carriedinto the i)rotector cabinet and protected by loricated conduit l)etwenthe floor and cabinet. Inside the cabinet the ))otliead wii-es s

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