Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 407
e of this coil and ground are connected the coils of the super- THE DIVIDED MULTIPLE SYSTEM. 385 visory relays, 6 and S, and the common battery. Each relay, whenoperated, serves to close the circuit of the corresponding super-visory lamp, and it will be seen that as long as the circuit of the… … FIG. 299.—CIRCUITS OF SUB-STATION APPARATUS FORFOUR-DIVISION SYSTEM, When, however, the subscribers receiver is hung up current flowsfrom ground at the central office through the battery and the cor-responding supervisory relay, thence through one side of the corre-sponding repeating coil to the…
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