File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14753399841).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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ole braces are used, the butt of thebrace shall be set at least 3i feet in the ground, on a firm support ofplanking, stone, or similar material. An approved method of in-stalling pole braces is shown in figure 124. Where it is necessary to raise guys over roadways or to clear obsta-cles, guy stubs should be employed, as shown in figure 125. The stubs 198 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. should have a top circuiuference of not less than 18 inches and shouldbe set in the ground to a depth of at least T) feet, and should lean awayfrom the pole to which the guy is atta<-he(l. In general practice two turns of the guy should he made aroundeach pole, one end of the block attached to the body of the messengeror guy and the other attached to the free end, the fall of the blockspassing back and down to the ground over a convenient stub or snatchblock. All anchor guys, head guys, and corners should be pulled withtwo sets of guying blocks, one being used as a hi If for the other set.
Text Appearing After Image:
o Fig. 11 -Deadmnn and anchor rod. TRANSPOSITION. Tt may be found necessary in some cases to transpose a metalliccircuit to pi-event cross talk between telephone lines or interferencefrom foreign circuits. In general, however, it will be found that theaerial lines installed by the Signal Corps are not of sufficient lengthto require transposition. Where it is necessary to transpose, themethod shown in figure 120 siiould be followed. ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. 199 In making a transposition the use of corner poles or curves shouldbe avoided as far as practicable. On long lines it will Ix^ found convenient to ha^e a test stationwhere the line may be opened and tested both ways for the locationof trouble. A form of test station made on a two-piece transpositioninsulator is shown in tieure 127. a a a so af^a a a s a a a a a a a alcana a a a a a

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