Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 199
signal to the operator, asan indication that her attention is required on that line. After thecall has been received on a line, the drop is of no further use, whilethe line is being used by the subscriber for conversation, and there-fore arrangements are made in each spring-jack to cut of? the… … FIG. 155.— GROUNDED-CIECUIT SWITCH-BOARD. for conversation, at the same time cutting ofT the call-receiving de-vices or drops belonging to those lines. The operator is also providedwith a telephone set represented at T, and a calling generator repre-sented at G. One terminal of each of these is…
Telephone
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