Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 498
s are simple and effective, but are subject to the samedisadvantages as those coin collectors which have no electrical con-nection with the central office, the principal one of which is theamount of attention required by the operator to assure the properregistration of the meter. This fault is… … FIG. 347.—GRAY PUSH-BUTTON METER. consists of an electro-magnetically operated meter placed at eachsubscribers station, the operating coil of the meter being placed ina bridge of the telephone line which includes the talking apparatus.This device is adapted to use on common battery lines, and…
Telephone
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
