Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 504
the same type of meter, but instead of mak-ing the operations of the magnet B depend on the insertion of theanswering plug into a jack it was made to depend on the actionof the calling siipervisory relay of the pair of cords used, so thatinstead of registering when the answering plug was inserted… … FIG. 351.-SCRIENER METER SYSTEM. plicated and probably unsatisfactory condition of circuits dependingon marginal resistances for securing the operation of the meter,and has probably never been put into extensive practice. The Bell companies are using, to some extent, a measured ser-vice device…
Telephone
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