The art of electro-metallurgyD. Appleton and Company, 1877 - 390 pages |
Contents
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Common terms and phrases
acetate action added alkaline alloys aluminium ammonia ammonium anode antimony argentic battery bismuth black powder boiling brass cadmium carbonate cathode Chemical clean Coating iron colour containing copper corroded crystalline crystals cyanide of potassium cyanide of silver December decomposed deposited metal dilute sulphuric acid dipped dissolved distilled water electric current electro-deposited electro-metallurgy electrodes electrolysis employed evolved Fahr film fluoride formed free cyanide fused gallon german-silver grains gutta-percha heat hydrochloric acid hydrofluoric acid hydrogen lead liquid magnesium magneto-electric means melted mercury metallic deposit mixture mould nickel nitrate nitrate of silver nitric acid obtained ounces oxide oxygen palladium patent piece plate platinum positive powder precipitate produced pure quantity reguline salt saturated set free simple immersion Smee's cells soda sodium solu soluble solution of cyanide substances sulphate sulphate of copper sulphide sulphuric acid surface Tellurium thick tion vessel voltaic washed whilst wire zinc
Popular passages
Page 4 - 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 13 - 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 3 - It is well known to experimentalists on the chemical action of voltaic electricity, that solutions of several metallic salts, are decomposed by its agency, and the metal procured in a free state. Such results are very conspicuous with copper salts, which metal may be obtained from its sulphate (blue vitriol) by simply immersing the poles of a galvanic battery in its solution — the positive wire becoming gradually coated with copper. This...
Page 8 - ... 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.
Page 16 - There is a sort which acts much better, in which is a portion of gold. I had, however, a complete metalliferous coating on the surface of the model, by which I was enabled to deposit a surface of copper on it by the voltaic method I have already described. I have also gilt the surface of a clay model with gold leaf, and have been successful in depositing copper on its surface. There is...
Page 7 - The gas glass, with the wire, was then placed in the vessel containing the sulphate of copper. " It was then suffered to remain, and in a few hours I perceived that action had commenced, and that the portion of the copper rendered bare by the scratches was...
Page 11 - I discovered a delicate trace of lead, exactly corresponding to the lines drawn on the cement previous to the immersion in the dilute acid. The cause of this failure...
Page 13 - I had often practised with some degree of success a method of preventing the oxidation of polished steel, by slightly heating it until it would melt fine bees'-wax ; it was then wiped apparently completely off, but the pores or surface of the metal became impregnated with the wax. " I thought of this method, and applied it to a copper coin. " I first heated it, applied wax, and then wiped it so completely off, that the sharpness of the coin was not at all .interfered with. I proceeded as before,...
Page 8 - I had in my power to regulate at pleasure, by the thickness of the intervening wall of plaster of Paris, and by the coarseness or fineness of the material. I made three similar experiments, altering the texture and thickness of the plaster each time, by which I ascertained that if the plaster...
Page 267 - ... the cathode, and a sheet of platinum as the anode ; gas was evolved freely from the latter, and the liquid became heated. M. Corbelli, of Florence, deposits aluminium, by electrolysing a mixture of rock-alum, or sulphate of aluminium, and the chlorides of calcium or of sodium, the anode being formed of iron wire, coated with an insulating material, and dipping into mercury placed at the bottom of the solution ; and the cathode of zinc immersed in the solution. Aluminium is then deposited upon...