Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 237
ng posts of this telephone beingconnected to a two-conductor flexible cord terminating in a two-conductor plug. When a call is received over any line, the attendantmay answer by taking the telephone receiver off its hook, and in-serting the plug into the jack of the line on which the call… … FIG. 19S.—WALL TYPE S\\ ITtH-r,OARD \\ITH RINGERS. This arrangement has the advantage of simplicity and cheapness,and the fact that it is not capable of quite such rapid manipulationis not a disadvantage where only a few lines are to be handled. The idea in the previous paragraph of using an…
Telephone
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