Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 439
ady discussedin a previous chapter. This line is shown connected with a regular exchange line at theright of the figure, the connection being made through the cord cir-cuit at the branch exchange, the private branch trunk, and the regu-lar A operators cord circuit at the main exchange. The… … FIG 314-CONNECTION BETWEEN PRIVATE-BRANCH AND CITY SUE- SCRIBERS WHEREIN THE PRIVATE-BRANCH SUBSCrjBER CON-TROLS THE SUPERVISORY SIGNAL AT THE MAIN OFFICE. 97 ■tl^ 418 AMERICAN TELEPHONE PRACTICE. in series with a two-microfarad condenser between the two sides ofthe trunk line. Both sides of the…
Telephone
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