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 226
st is F——-— where F is resistance to fault, L is result of meas-urement as per Fig. 114, and r is result of measure-ment as per Fig. 115. The explanation of this testis that the resistance necessary in rheostat in Fig.115 to make a balance simply places point X at thetheoretical center of the loop… … If in Fig. 114 we obtain a balance with 220 in Rand in Fig. 115 a balance is obtained with 50, then220 — 50 gives us 170, and this divided by 2 givesus 85 as resistance to X. Let us further assumethat the wires are of the same kind and gauge; thenit follows that 85 ohms is also the resistance…
Electric testing · Electric apparatus and appliances
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