Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 117
or with zinc sulphate from another bat-tery. In cases, however, where the battery is in constant use, itvery rarely happens that the blue line reaches too high a level, andthe reverse is more likely to take place. If the blue line reachesthe upper portion of the copper, more crystals of bluestone… … FIG. 72.—THE GORDON CELL. for closed-circuit work, but are not well adapted to telephone workin general on account of their high internal resistance. A cell of more recent origin than any of the types so far describedhas come into limited use for certain classes of telephone work.This is the Gordon…
Telephone
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