Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 462
In this system each stationis provided with a relay especially designed for use with alternatingcurrents, each relay being bridged across the metallic circuit of theline in series with a two-microfarad condenser. This arrangementis shown in Fig. 327, which shows two four-party lines connectedby the… … FIG. 327.—THOMPSON & ROBES PART.Y-LINE SYSTEM.440 PARTY LINE SYSTEMS. 441 biased bell to earth from one leg or the other of the metallic line,such connection being made only during the process of ringing.The ground branches are detached from the line at all times, exceptduring the ringing…
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