File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14570077027).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. 31. ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. 67 corners, due to the fact that the tendency for the discharge to leavethe wire is greater at these points and that there is an air gap be-tween the mica phites. AMiile these coils are a protection againsthigh frequency current, they are not affected by continuous or lowfrequency current. It is also found that in the case of high potentialdischarge a low resistance circuit is set up to ground, which causes anabnormal current to flow through the arrester. To provide againstthese abnormal currents a form of fuse is usually installed in connec-tion with the outside gap F. These fuses are provided with a finewire for carrying current mounted on a mica strip in the case of theMason arrester. This wire is burnt off by excessive current on thus
Text Appearing After Image:
Fig. .32.—Mason lightning arrester witli Z link fuse. opening the circuit. It will be seen from this that the line shouldinvariably be connected to the fuse side of the arrester. TERMINAL OFFICE SAVITCHBOARD AND BATTERY ARR.\NOEMENTS. The general plan of the terminal switchboard is shown in figure 33,introducing a row of spring jacks at the bottom of the board. Themethod of utilizing these in cutting in sets of instruments by insertionof the double flat plugs is shown. These flat plugs, with hard-rubberinsulation between the metal strips composing them, are connectedwith flexible insulated double-conducting cords leading to the sets ofinstruments. It will be seen that each line comes in through a fusewire to the top spring contact of the jack, and. if no plug is insertedpasses through the back contact and up to one of the vertical straps ofthe board. The insertion of a round conical plug at the appropriate 68 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. disk connects it to the battery

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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:70
  • bookcollection:cdl
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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