. 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 . metal is a binding screw,to form connections. A cell of this de-scription is put into action by placing itsseveral parts as shown in the figure; fillingthe porous tube containing the zinc with amixture of
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. 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 . metal is a binding screw, to form connections. A cell of this de-scription is put into action by placing itsseveral parts as shown in the figure; fillingthe porous tube containing the zinc with amixture of one part sulphuric acid and tenparts water; and filling the copper cellwith a saturated solution of sulphate ofcopper.—By saturated is meant a solutioncontaining as muck of the salt of copper as the waterwill take up. This is prepared most readily by pouringboiling water on a superabundance of crystals of sul-phate, and stirring them; to this solution one-tenthacid should be added. The perforated metal shelf, shown in the figure, is to support a supply of crystalsto recruit the exhausted strength of the battery (§ 50).The crystals are placed thus high up in the liquid, because the upper portions are exhausted first; thespecific gravity keeps the strong parts of the solutionbelow. 19. Note on Voltaic Batteries.—While on the sub-ject of voltaic pairs, it will be as well to pen a few. 22 ELECTROTYPE MANIPULATIONS. lines on the powers of the battery, which are not di-rectly connected with the art of electrotype.—If a cellof the constant battery be charged as directed above, and a piece of fine platinum wire be stretched from thescrew attached to the zinc, to that attached to the cop-per, it will attain a red or a white heat. This is termedthe heating power of a battery. The larger thecell, the greater, thickness of wire will be heated. Iftoo thin a wire be used, the passage of the electricitywill be so much retarded as to produce no visible indi- Fig. 2.electrotypemanip00walk