Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 652
r direct communicationwith the chief operator. It is the custom of many of the independent companies, hut asa rule not of the Bell companies, to provide on the chief operatorsor monitors desks, a lamp for each position on the main switch-board, this lamp being wired so that when the calling pilot… … FIG. 460.—CHIEF OPERATORS TELEPHONE CIRCUIT. usually extended also to the chief operators and monitors desk,the arrangement being such that two lamps are provided for eachposition on the main board, one adapted to light whenever the linepilot at that position lights, and the other wh-enever the…
Telephone
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