Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 738
tary wipers have been connected, it fol-lows that all of the private contacts of that trunk on other switchesare grounded, and this trunk line will therefore be held busy toother incoming calls in the same group of subscribers. This ex-plains how the ground connections are put on busy trunks, as… … FIG. EI6.-FIRST AND SECOND SELECTORS AFTER PULLING FIRST DIGIT. and the connection is therefore continued from the line to the trunkline formed by the two wires, F and R, leading to a second selector. The first step in securing the desired connection is now accom-plished, and the conditions with…
Telephone
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