The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 234
Fig. 233 this enabling the speaking currents to pass, but preventingthe battery current. By this means independent clearingor ring-off signals could be obtained from ring-off drops,E.O.D., for each sub-station, as shown in Fig. 233. It will benoticed that special drops are used for clearing,… … Fig. 234 system for speaking, which is shown in Fig. 234. It will beseen that the common battery, C.B., is included directlyin each of the speaking circuits, being connected to the sleeveconductor of each of the connecting cords. The inventorpointed out that unless the battery was of extremely…
Telephone
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
