Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 394
order-wire pilot lamp isso wired, in connection with the night alarm, as to ring wheneverthe order-wire pilot lamp lights, if the night alarm switch is in theproper position. Automatic ringing, as applied to some of the European work in-stalled by the Kellogg Company, is so arranged that the… … FIG. 291.—KELLOGG AUTOMATIC RINGING CIRCUITS. of operating is brought about by means of the circuit shown inFig. 291. In this it will be seen that the ringing current is thrown on toeach cord circuit by an extra armature of the relay, C, which is inthe sleeve side of the cord, which relay is always…
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