Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 390
ing conditions exist: The relay. A, atthe incoming trunk end will be operated from current received frombattery, B, at the first exchange, over the metallic circuit of thetrunk line, causing this relay to attract its armature. This will causethe lighting of the disconnect lamp over a path which may… … FIG. 290.-CONNECTION BETWEEN TWO SUBSCRIBERS THROUGH TWOOFFICES—KELLOGG SYSTEM.368 TRUNKING SYSTEM BETWEEN COMMON BATTERY OFFICES. 369 very high resistance of the relay. A, the current flowing over themetallic circuit of the trunk line will not operate the supervisoryrelay, R\ of the A operators…
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