History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 48
uric acid, in which the zinc is immersed, and asmall cell of porous earthfilled within with nitricacid. In this acid isplaced the platinum plate,in metallic contact withthe zinc of the succeed-ing or following cell.This contact is estab-lished between the armof the zinc cylinder (Fig.9) and the… … Fig. 8. iig y. this in view, the zinc cylinder is made hollow, and encloses3* 30 PRELIMINARY NOTIONS. the porous unglazed earthen cylinder, into which passes a thinstrip of platinum, one inch in width by three in length; the armof the zinc of the preceding cup projects over the porous cylin-der so…
Telegraph
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