Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 345
ectedwith the hne. When a cut-off relay is operated by the insertionof a plug into a jack the line relay and line-signaling apparatus iscut completely clear of the line by the breaking of the back con-tacts on the cut-off relay, while the jacks are connected with theline by the making of the front… … FIG. 269.—KELLOGG MULTIPLE SWITCH-BOARD CORD CIRCUITSIMPLIFIED. ploys two-conductor plugs and two-conductor cords, the answeringplug being shown at the left and the calling at the right. It willbe seen that the tip of the answering plug is connected with the tipof the calling plug through a…
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