Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 763
ctions of connecting the calhng and talk-ing apparatus alternately in the line circuit. The switch lever ismounted upon the shaft, A, which may be seen passing through tliefront board of the box and which carries a ratchet-wheel, E, ofhardened steel. A coiled spring around the shaft tends to rotate… … FIG. 525.—CIRCUITS OF HOLT2ER-CABOT SYSTEM. position to which it has been rotated, by the engagement with theteeth of the ratchet-wheel, E. Upon the short arm of the hook-switchispivoted a dog, G, adapted, when the receiver is placed uponthe hook to engage a notch in the pawl, F, and lift it out of…
Telephone
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