Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets (1907)
Schneider, Norman H. (Norman Hugh), Hargrave, Jesse · New York, Spon & Chamberlain; [etc., etc.] · leaf 101
by R and divided by .4. This is just simple proportion in arithmetic as thefollowing example shows. In simple proportion, toget the fourth term or answer, the second and thirdare multiplied together and divided by the first. 78 ELECTRICAL INSTRUMENTS For example, if 1 = 2 what will 4 equal? 9x4 1:2… … Fig. 59. The Post-Office Bridge. TTre connection for re-sistance tests of the form of bridge known as the(English) Post-Office Bridge is in Fig. 50. A tripod form of Thompson galvanometer isillustrated and an 18 cell battery but it is evidentthat a larger or smaller battery could be used. THE…
Electric testing · Electric apparatus and appliances
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
