File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14733561356).jpg

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English:

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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Text Appearing Before Image:
Fig. 114.—Office pole. ELECTEICAL INSTRUMENTS U. S. SIGNAL CORPS. 191 iron and copper Avires are dilierent. Soft copper ties should be nsedfor copper and soft iron for iron or steel line. Care should be takennot to injure the wire in tying to insulator and at the same time asecure fastening should be made. DoiilAe arms.—The approved method of installing double crossarms is shown in figure 114. The poles upon which the double armsare to be placed should be selected from the heavie,st of those avail-able, as these must l)ear an additional load, and extra strength shouldbe provided. In figures 1157> and 115r is shown the method of dead MetfJod of connecPonfor hard drain/n cop-per IVire
Text Appearing After Image:
Metfiod of connecfJonfor iron i/v/re SECTION THROUGH CROSS ARMS Fk;. lir.. ending Avires on double cross arms. Where the wires are not deadended, but pass through, they will be tied to both insulators in thelower groove of the glass, if double groove glasses are in place. BRACKET LINES. l\Tiere not more than two wires are required on a pole line, oakbrackets may be used in place of cross arms. The brackets should beattached to the pole with one 20d. and one 40d. nail and, in general,should be placed as shoAvn in figures 116ff and 116Z>. Where brackets 192 ELECTRICAL INSTRUMENTS U, S. SIGNAL CORPS. are placed on poles which may bo. at some later time, used to carrvcross arms, the top end of the bracket should be about level with the toj) of the gain, so that thebracket and its wire will notinterfere with the subsequentuse of the cross arm. OFFICI-: POLE. The terminal or office poleof a line carrving a number ofwires is the most importantpart of the line and demandscareful attention

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Flickr tags
InfoField
  • bookid:electricalinstru00unitrich
  • bookyear:1911
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:United_States__Army__Signal_Corps
  • booksubject:Military_telegraph____United_States
  • booksubject:Military_telephone____United_States
  • bookpublisher:Washington__Govt__print__off_
  • bookcontributor:University_of_California_Libraries
  • booksponsor:MSN
  • bookleafnumber:194
  • bookcollection:cdl
  • bookcollection:americana
Flickr posted date
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27 July 2014

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