Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 227
This she also restored by hand, and lastlywhen one or both of the subscribers rung, ofif, the drops of each linefell and were restored by hand, thus making four in all. Suchswitch-boards are, of course, necssarily slow. ^Moreover, they arealmost invariably much larger and more cumbersome than the… … FIG. 1S9.—REAR \IE\V KELLOGG DROP AND JACK. give an audible signal which will cease sounding as soon as theline current ceases. Of course, the ordinary magneto drop, if pro-vided with a night alarm attachment, may be made to give anaudible signal, but this signal persists as long as the drop is…
Telephone
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