File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14776464613).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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ditierenceof potential, and the line C B represents the fall of this to B alongthe uniform Avire, then at any point, say at A, the height D E Avillrepresent the potential difference between B and E, Avhich is propor-tional to the length of wire or resistance remaining. If we take a circuit divided at A (fig. 174). the fall of potentialalong the wire .4 E B is equal to that along the wire .1 G B: andhaving passed over a certain proportion of the total resistance .1 E B,if we join the point PJ through the galvanometer (voltmeter) with a ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. 255 point G\ Avhere the same proportional part of resistances ^1 G Bhave been passed over, E and G will be of the same potential, andno current Avill pass through the galvanometer. It can be proven thatAvhen the resistances of the divided circuit bear this proportion—■A E : A G^ : : E B \ G 7?—the points E and G are at the samepotential with respect to each other and the galvanometer will not bedeflected.
Text Appearing After Image:
The relation of parts in the conventional diagram of the AVheat-stone bridge (fig. 175) will now be aj^parent. If the resistance in thecoils of ^1 and B are equal or bear any other simple numerical rela-tion, then the same numerical relation exists between R and A, and ifR be a box of known resistance coils, X, the unknown resistance,becomes known from the above-stated relation A : B : : R : X.

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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:258
  • bookcollection:cdl
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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