File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14754200714).jpg

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Description
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:
ed with a hand generator for ringing purposes, night-bellcircuit, battery-test key, line-pilot lamp, and operators set complete.In addition to the central energy visual line signals 5, 10, and 20magneto lines and drops are provided in the 50, 100, and 200 lineswitchl)oards respectively, for the accommodation of long lines andfor interpost lines running in aerial wire or submarine cables, andfor commercial trunks. In special cases the luunber of these mag-neto linos can be increased in all sizes of switchboards to meet localconditions, but this can only be done satisfactorily at the time ofmanufacture. ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. 149 Protector equipment, consisting of heat coils and carbon lightningarresters, are provided for all central-engery switchboards. For the50 and 100 line sizes a terminal cabinet is provided in which this pro-tector equipment is installed. This cabinet conforms in the essentialdimensions to that of the switchboard and is erected as a part of the
Text Appearing After Image:
latter, the cabinets being bolted together in such a way as to, in allappearances, comprise one piece of apparatus. The protector equip-ment furnished usually consists of the Cook type L-8 or AVesternElectric type 81—B heat coils and carbon arresters. In addition, eachcabinet is equipped with sufficient line strips upon which to terminate 150 ELECTRICAL INSTRUMENTS U, S. SIGNAL CORPS. the incoming outside cable. This protector equipment will be de-scribed in further detail in another paragraph. The circuit of thesecentral energy visual supervisory switchboards is shown in figure 03, One neg lead iorall cords Q P Binding p istsfi <rtmns cord

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Flickr tags
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  • 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:152
  • bookcollection:cdl
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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