Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 883
nections of arms, A andB, with R and X. Thus with the plugs in the position shown bythe black dots the connection is precisely as shown in Fig. 626, J pand the equation -5- :^ --- holds true. If, however, the plugs are inserted in the holes on the other diagonal, arm, A, will be con-nected to arm,… … FIG. 629.—CIRCUITS OF PORTABLE TESTING SET. while the resistances of B are 10, 100, and 1000 ohms. Therefore,if a ratio of 1000 to I for measuring large resistances is desired,the plugs are inserted in the commutator along the arrow H (Fig.628) ; while an opposite arrangement of the plugs along the…
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