Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 219
d drop and jack, when properly made, possesses someadvantages not to be found in the electrically restoring type of MAGNETO SHITCH-BOARD FOR SMALL EXCHANGES. 197 drop. In the first place, all the additional coils on the drops, andthe additional contacts on the spring-jacks and the additional… … FIG. ISO.—WESTERN COMBINED DROP AND JACK. must insert her plug; while in the forms where the jacks and thedrops are entirely removed from each other the operator must firstlook at the drop, ascertain its number, and then look for the corre-sponding number of jack on the board below. This very…
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