Meadowcroft, Wm. H. (William Henry), b. 1853 · New York & London, Harper & brothers · leaf 120
r motor for a few minutes, youcould pull the zinc upfrom the solution andput it down again whenyou wanted the elec-tricity once more. Thecarbon element in thebattery is not consumedby the acid, althoughthe zinc is. Now you will see theuse of the porous cup.We will take as an il-lustration of this… … Fig. 31 A-B-C OF ELECTRICITY is usually used water made slightly acid, andthe strong solution of sulphuric acid and bi-chromate of potash (or chromic acid) ispoured in the porous cup, where the carbonis placed. The strong solution penetrates the porouscup very slowly and gets to the zinc, when…
Electricity
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