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 180
the effective power of thebattery. This may be overcome by enlarging thebattery. CABLE TESTING. 157 Before making the test the copper core resist-ance of the loop between M N must be knowneither by calculation or measurement. The latter is known as the Varley test, a morecomplete description is as… … Fig. 90. cable is looped or connected at its distant end Dwith a good cable. To obtain a balance it is clear that the rheostatr must be adjusted until its resistance added tothat of the cable core between M and F togetherequal the resistance of the core from F to N. It is also clear that the…
Electric testing · Electric apparatus and appliances
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