File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14570073667).jpg

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Description
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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

View Book Page: Book Viewer
About This Book: Catalog Entry
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Text Appearing Before Image:
Fk;. 24. The legless key is shown in figure 24. The binding posts instead ofthe legs are connected to line and battery, respectively. The partscorresponding to the leg key are similarly lettered. The open-circuit key has an insulated front and an insulatedback contact, and the circuit-closing lever is dispensed with. Asshown in figure 25, the screw C on the base of the key is connectedwith the relay, the insulated lower front contact, Z>, with the battery,
Text Appearing After Image:
and the insulated back contact. /:\ with the ground at a terminalstation or with the outiroino- wire at a ^ wav station. THE RELAY, The function of the relay is. briefly, to cause a comparatively yow-erful local current through a sounder to be controlled by a muchfeebler one in the main-line circuit. The relay coils are included inthe main-line circuit, the two l)inding posts on the right (fig. 26)being connected with the key and line, respectively, the binding posts ELECTRICAL INSTRUMENTS U, S. SIGNAL CORPS. 63 on the left being connected with the sounder and local battery,respectively. The main and local circuits are indicated by the

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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:65
  • bookcollection:cdl
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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