File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14570149737).jpg

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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

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Text Appearing Before Image:
FRONT Thin cJotti gluedtv this before scremn^c DETAILS OF CLAMP Fig. 180. These cases are never used where tools are not available, but it isassumed that they willfrequently be used at points remote from theinstrument repair shop. The data herein, together wnth the descrijD-tive matter, which forms a part of the case, cover all the necessaryinformation for making emergency repairs. In addition to thestandard list of parts, shown on page 258, the case should always besupplied with an ample quantity of cable blanks and cable tags. 260 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. THE GALVANOMETER. A reflecting DArsonval galvanometer is supplied, arranged formounting- on a tripod. It is provided viith a short insulated telescopearm and an optical system, which magnifies the image of the scale.Owing to this magnification, it is necessary to mount the instrumenton a solid floor or to provide against jars while testing, which tend tonudve the image indistinct.
Text Appearing After Image:
Fig. 181. As in all the instruments of this type, the frame is on one side of thecircuit, and the tripod legs should be wii)ed thoroughly (hy hefort-making a test. This ))recautionarv measure should always be taken. The .sensibility of this instiument is 3()() megohms. This is deter-mined by the fact that one volt through one megohm will deflect themirror oOO scale divisions. Figuie 180 shows tb.e construction of thisinstrument. 100,000-0II.u Hox. The 100.000-ohm box is a circular rubl)er case having mountedtherein 10 coils Avound with No. 40 B. & S. manoanin wire. Should ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS, 261 trouble occur with this device the proper-sized wire will be found inthe spare-parts case. This box is held together with two screws.(Fig. 181.) COMBINED SHUNT AND KEY. This shunt and key, or button, takes the place of the usual Ayrtonshunt, battery, key, and short-circuit key. Its connections and gen-eral construction are shown in tiaure 18-J.

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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:263
  • bookcollection:cdl
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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