Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 318
ed by the falling backof the corresponding supervisory relay armature, and when both ofthe lamps are lighted the operator will know that disconnection isdesired. In Fig. 249 is shown the circuits of a comnion-battery system usedfor small exchanges based on the Stone system of transmission shownin… … FIG. :49.-SCRIBNER COMMON-BATTERY SYSTEM. The line signal is automatically operated by the removal of thesubscribers receiver from its hook, and is effaced by the insertion ofa plug into the jack, which act opens the signal circuit at the jack.Current from the battery now circulates through the…
Telephone
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
