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acetate action added alkaline alloy aluminium ammonia ammonium anode antimony aqueous solution bismuth boiling brass cadmium carbonate cathode caustic potash Chemical chloric acid chloride of silver coating cobalt colour containing copper corroded crystalline crystals cyanide of potassium cyanide of silver decomposed deposited metal dilute sulphuric acid dissolved distilled water electric current electro-deposited electrodes electrolysis employed Fahr film fluoride formed free cyanide fused gallon german-silver gilding grains gutta-percha heat hydrochloric acid hydrofluoric acid hydrogen iron lead liquid magnesium means mercury metallic deposit mixture mould nickel nitrate nitric acid obtained ounces oxide oxygen palladium plate platinum positive powder precipitate pure quantity received a deposit reguline saturated separate current set free simple immersion Smee's cells soda sodium solu soluble solution of chloride solution of cyanide stirring substances sulphate sulphate of copper sulphide sulphuric acid surface Tellurium thick tion vessel voltaic washed whilst wire yields zinc
Page 6 - It occurred to me, therefore, that if the surface of the plate was engraved, an impression might be obtained. This was found to be the case ; for on detaching the precipitated metal...
Page 15 - I accordingly determined to make an experiment on a very prominent copper medal. It was placed in a voltaic circuit, as already described, and deposited a surface of copper on one of its sides, to about the thickness of a shilling. I then proceeded to get the deposition off. In this I experienced some difficulty, but ultimately succeeded. On examination with a lens, every line was as perfect as the coin from which it was taken.
Page 10 - ... and easily separated ; on the other hand, if I made them thicker, and of a little finer material, the action was slower, but the metallic deposition was as solid and ductile as copper formed by the usual methods, — indeed, when the action was exceedingly slow, I have had a metallic deposition apparently much harder than common sheet copper, but more brittle.