Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 727
sent, as a result of which the various switches are started in theirrotary movements. The letters, V and R, will be used through-out this discussion as designating the vertical and rotary sides ofthe line, respectively, or such extensions thereof as may be brought AUTOMATIC SWITCH-BOARD SYSTEMS.… … FIG. EU.—CIRCUITS OF SUBSCRIBERS INSTRUMENT. impulse-sending springs, i and 2. These two springs are so movedby the dial of the impulse transmitter, the action of which hasalready been explained, that upon the return movement of the dial45 706 AMERICAN TELEPHONE PRACTICE. the spring, I, makes as…
Telephone
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