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 217
g a disturbance between the two or thedevelopment of some other symptom with whichthe testing chief very soon becomes familiar.Fig. 106 shows the testing relay standing closed toan intermediate ground while the distant end isopen. 193 194 ELECTRICAL INSTRUMENTS. Fig. 107 shows the testing relay… … i Fig. 106. jr~\jDp^ Fig. 107. is told to open or ground the wire until the locationof the fault is definitely determined between stations.In the case of crossed wires, the distant stationis told to open both wires, and a battery is thenapplied to one, and the other is grounded throughthe testing…
Electric testing · Electric apparatus and appliances
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