File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14756518395).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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vided with an adjusting arrangement by means of which its capacityis increased or decreased until it is found to furnish current whichexactly offsets that due to the static capacity of the line. AMien suchis the case the line is said to be balanced for static. In order tobring about this balance more accurately it is sometimes essential to60240° 11 6 82 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. use two or even three condensers, arranged in multiple and with aresistance coil inserted before each of them. In figure 41 such resist-ance coils re and re are shown placed between condensers C and 6and the artificial lines. Figure 42 shows the location of the apparatus in a station and thewiring connections necessary to its installation. The galvanometershown is for the purpose of indicating when a perfect balance hasbeen obtained. The effect of the resistance coil is to retard and diminish the con-denser charge and discharge to conform more closely to the actualconditions of the main line.
Text Appearing After Image:
^-:r- DlFfERENTlAL DUPLCX. Fir.. 42. Lack of rheostat or resistance balance is shown on galvanometer orrelay by steady deflection or action as long as key is depressed.Whether too nmch or too little is unplugged in rheostat is shown bythe direction of galvanometer deflection. Lack of static balance is shown by a kick of galvanometer orrelay tongue at the instant key is opened or closed. The center metalstrip on rheostat being connected by plugs to the resistance buttons,balance is obtained by throwing otf more or less of the microfaraddivisions on the condenser. A whole division is thrown off by dis-connecting the wire from one of the binding posts on the left. Bal-ance is completed by the plugs across the top division. The connec-tions to retarding coils are shown in diagram (fig. 42). The amount ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. 83 unplugged in each depends on the resistance of the cable. In a cable,for example, where the resistance is about 2,000 ohms, 400 to 500 ohmsout o

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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:85
  • bookcollection:cdl
  • bookcollection:americana
Flickr posted date
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27 July 2014

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