. Electrotype manipulation : Being the theory and plain instructions in the art of working in metals, by precipitating them from their solutions, through the agency of galvanic or voltaic electricity. Also in the arts of electro-plating, electro-gilding, and electro-etching; with an account of the mode of depositing metallic oxides, and of the several applications of electrotype in the arts . arly exhausted. By this means, the sur-face of the copper obtained presents an infinite numberof small points, which very readily part with the hydro-gen. The principle is precisely that developed by
. Electrotype manipulation : Being the theory and plain instructions in the art of working in metals, by precipitating them from their solutions, through the agency of galvanic or voltaic electricity. Also in the arts of electro-plating, electro-gilding, and electro-etching; with an account of the mode of depositing metallic oxides, and of the several applications of electrotype in the arts . arly exhausted. By this means, the sur-face of the copper obtained presents an infinite numberof small points, which very readily part with the hydro-gen. The principle is precisely that developed by , and brought to practice in his platinized battery.—This arrangement may be adopted without the use ofdiaphragms. Amalgamated zinc is employed. I findthat this kind of battery, variously arranged, is greatlyused in the arts. Sometimes a single battery is suffi-cient; at other times, a series of two, three, or four,having the zinc of one connected with the copper of thenext; as in Fig. 9.—I have myself been of late operatingwith this battery on a large scale, using surfaces of from10 to 14 square feet: if the copper surface has beenexposed to the air for any time, while the battery is out 60 ELECTROTYPE MANIPULATION. of use, it should be well washed with acid water, or theold solution of zinc, before using it again, in order toremove any oxide of copper that may be there. Under. these circumstances, I have every reason to be satisfiedwith its action, and to prefer it, from its simplicity andsteady action, to any other form. 71. Prince Bagrations Battery.—A pan is filledwith earth, which is then saturated with a solution ofsal-ammoniac ; a copper plate, having been first wettedwith solution of sal-ammoniac, and then exposed to theair until a green film is formed, is thrust into the pan ofearth ; and opposite to it is thrust a zinc plate. speaks favorably of this source of a constantpower for the reduction of metals. 72. The Earth a —When slow acti
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