Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 880
f the bridge is very simple. First some ratiobetween the arms A and B is determined upon. The battery isthen connected between the proper binding posts, and likewise theresistance to be measured is connected between its binding posts. The battery key is first depressed and then the galvanometer… … FIG. 627.—PORTABLE TESTING SET. accordingly until the galvanometer needle shows no deflection uponthe operation of the keys. We then know that our equationA R B and consequently X holds good. A That is, the nuknowii resistance is equal to the ratio between Band A multiplied by the resistance in the…
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