File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14569877130).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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cabinet can I);* hinged on either -idc and the -trij)schanged inside so any condition can be uk^. The two cabinets are exactly alike in finish and essential dimen-sions and l)uilt to be erected together. The line cables from the 50 and 100 line switchboards are nsuallyconnected to that end when received, and sufficient length allowed forconnecting to the arrester strip in the protector cabinet, to which theyare run by cutting a hole in the bottom of the partitions ))etween thetwo cabinets and lacing the cables too;ether. ELECTRICAL 1^STRUMENTS U. S. SIGNAL CORPS. 175 The line cables are butted and formed as described in this chap-ter, the color code being follo^Aed carefully, and cori-esponding num-bers on the arrester strip assigned to line signals of same number.The magneto drops are connected immediately below the centralenergy lines, allowing for full capacity of the switchboard. The fullprotector equipment is furnished in the protector cabinet for eachcentral energy switchboard.
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Fi(i. 1U7.—Swil! i ii^(all;itiuii (tcriiiiual caluiiit ou ri;;ht). The i20-pair line cables are boiled in beeswax preferably, or paraffinif necessary, and laced u^d into one form and strapped securely to thel)ack of strip on which arresters are mounted, as shown in figure 107.The -wires should be carefully soldered to the springs, first w^rappingthe wire around notch, which is already tinned. The line cable provided for central energy switchboards is insu-lated with two silk and one cotton covering and has no particularmoisture resisting qualities. It should never be installed under a 176 ELECTRICAI. INSTRUMENTS U. S. SIGNAL CORPS, floor where it may become wet from scrubbing or l»y any otlnn- means.It will retain its insulation when installed in a thy room, but it isnot intended for exposure. Neither should this type of cable be usedfor potheadino- the outside line cables. The cables to the outside circuits shoukl be brought to the cabinetin the most workuuuilike way that Avill me

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