The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 132
Fig. Ill Fig. 112 on the shunt method. In the first the movement of theswitch-hook, after taking the receiver off, connects up thespeaking circuit, and completely breaks off the ringing circuit;while in Fig. 112 the same movement does not break eithercircuit, but simply short-circuits the ringing…
Telephone
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-344-145.webp)
