Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 654
ome cases where nickel-plated frontshave been provided for the operators transmitters, these have beenkept carefully polished and used as a mirror, by which the operatorcould observe the actions of the chief, seated behind her. This isone reason for the usual black finish of the operators… … i-iHE^ i_r.piP CHIEF OPFl3. DESK., MULTIPLE. POfKHD. FIG. 4C2.—METHOD OF CONNECTING LINE FOR OBSERVING SERVICE. intermediate distributing frame, and by means of three-wire jumpers,any one of them may be connected to any subscribers line. Aregular Western Electric line circuit so connected by means…
Telephone
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