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 99
be greater than x, current flows through 75 76 ELECTRICAL INSTRUMENTS. A and through x by way of the galvanometer, andthe needle is deflected, but in the opposite direc-tion to the former case. The Whcatstone bridge is based on the fact thatno current flows between points of equal potential.… … Fig. 58. If the galvanometer be connected to a point ineach wire equally distant from either end, say themiddle of each, no current will flow in the gal-vanometer. The effect is the same as if both terminals ofthe galvanometer were placed on the same spotin a single wire carrying current. Shift one…
Electric testing · Electric apparatus and appliances
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