Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 251
seof preventing disturbances in the line with which the plug, P, is con-nected from giving a false busy test. The line circuit andcord circuit shown in Figs. 204 and 205 wereat one time standard with the American Bel! Telephone companies,the most notable case of their use being in the old Cortlandt… … FIG. 205.—CORD CIRCUIT FOR METALLIC CIRCUIT SERlEi-ULTIPLE BOARD. landmark in switch-board development, and therefore the actual cir-cuits emplo3ed in it may be of interest. There were both groundedand metallic circuit lines used in this exchange, the wiring of eachline, as vvell as that of the…
Telephone
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