The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 143
ks being then needed. Many different sub-station circuits have been devised, inorder to get the best results in regard to speaking from C.B.working. A few of the most important will now be given inoutline. The first development in the design of C.B. sub-stationcircuits was in the use of an… … Fig. 128 Fig. 129 pendent companies in America, including the Stromberg-Carlson Co. The Western Electric Co.s System.—This system, whichis probably the one most extensively used, is shown in Fig.129. It is employed in this country in several of the NationalTelephone Co.s exchanges, and by the Post…
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-electricengineer03inte-153-92.webp)
