Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 272
romthe A boards a number of B trunks lead back to each of theB boards. When a subscriber, as for instance the one shown at the top ofthe figure, removes his receiver from its hook, his indicator, /, is 250 AMERICAN TULEPHOXE PRACTICE. displaced automatically, and the operator at the particular ^B… … The operator at the A board, having leajned the desire of thecalling subscriber, extends the circuit to tjiat subscribers line bymeans of the B trunk, still further on to the particular B boardat which the jack of the called subscribijr is placed. This the TRANSFER S VST EMS. 251 A operator does by…
Telephone
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