Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 237
action of the cell dissolves the zinc, setting freehydrogen, which is changed to water by the copper 238 ELEMENTARY ELECTRICITY oxide, which is reduced to pure copper by giving up theoxygen in it. The Dry Cell. Shown in Fig. 120 is really a moistcell sealed up water tight with cement or glue. The… … Fig. 120. Dry Cell. filled with a mixture of plaster, oxide of zinc and flour;the whole being soaked with a solution of sal ammoniacand zinc chloride. Pressure 1.4 volts. These are very useful for testing, as they can becarried around in a satchel or your overcoat pockets. Whenever they are used in…
Electricity
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