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 241
ed so that a throw ofcertain switches places the organization in positionfor the Varley, Murray, or simple loop resistancemeasurement. It will be noticed in Fig. 124, which shows thetheoretical arrangement of the bridge, that thereis no chance for imperfect contacts in arms to giverise to… … Fig. 124. The resistances in the arms are as follows: a =9.90.1 ohms, b = 81.008 ohms, c = 409.091 ohms,d = 409.091 ohms, e = 81.008 ohms, / = 9.901ohms. Total, 1000 ohms. It will be found by add-ing the resistances on each side of any given ratiopoint that the marked ratio obtains when the…
Electric testing · Electric apparatus and appliances
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