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American telephone practice (1905)

Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 889

An illustration from American telephone practice, 1905, leaf 889
show this relation, assume that a multiplying power•of I GOO is desired, then 1000 = ^^—. IOO0i?s J?s. = J?g. * 1000 — I 999 A commercial form of shunt box is shown in Fig. 634, the variousmultiplying values of the shunt being obtained by plugging the blockcorresponding to the multiplying power… … FIG. 634.—SHUNT BOX. to the deflection read through the telescope. The current is, ofcourse, inversely proportional to the total resistance of the circuit,and from this it follows that the deflections are inversely proportionalto the resistance. This fact enables the galvanometer to be used…

Telephone

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