Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 218
battery which is closed by the insertion of a plug intothe spring-jack of the line belonging to that drop. \arious arrangements associating drops of this type with theline circuits and with the local circuits at the switch-board have beendevised and put into practical operation, the arrangement in… … FIG. 17n.-P,ELL SELF.RESTORING DROP. Two sleeves or thimbles, k k^, are shown on the jack, the inner one,k, being connected permanently to ground through a battery, k^The outer thimble, k\ is connected to the ground directly through therestoring coil, d. When with this arrangement a plug is…
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