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 179
feet. 156 ELECTRICAL INSTRUMENTS. To properly understand the Varley and Murraytests consider a Wheatstone Bridge the arms ofwhich are equal. The rheostat is replaced by alength of cable and the unknown resistance is alsoreplaced by a length of cable, both being similarin resistance per foot. If… … Fig. 89. Fig. 89. The added resistance equals that of thepiece cut off. If the resistance per foot is known, the lengthof the shorter piece can be easily calculated. Instead of connecting in the battery by a wireas shown, use earth connections at each point. The only result will be to interpose a…
Electric testing · Electric apparatus and appliances
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