Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 222
ving the thumb-nuts, i and 2. Great sensitiveness can never be attained with this drop, becausethe shutter rests upon the armature rod in such manner as to bear 200 AMERICAN TELEPHONE PRACTICE. upon it with its entire weight. It can therefore only be releasedby a considerable effort on the part of… … FIG. 1S4.—TOP VIEW, WITH COIL REMOVED. manufactured b) the American Electric Telephone Coiiipan)-. Inthis drop, which is shown in Figs. 183, 184 and 185, the actuatingcoil is mounted directly above the spring-jack. The coil is inclosedon the sides in a sheet-iron frame or box, C, for lessening the…
Telephone
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