Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 212
r rigidity and economyof space. The spacing of the jacks in this strip is the same as thaton the drops shown in Fig. 169, and therefore these jacks may be 190 AMERICAN TELEPHONE PRACTICE. used in connection with the drops, being mounted directly above orbelow them in the same switch-board cabinet.… … FIG. m.-RINGING AND LISTENING KEY. of which have survived. One of the most common types is shownin Fig. 171, in which is represented the under side of the key shelf.The handle by which the key is operated projects through theshelf, and is shown at the top of the cut. This handle is pivotedwithin…
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