The Art of Electro-metallurgy Including All Known Processes of Electro-depositionLongmans, Green, and Company, 1877 - 395 pages |
Contents
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Common terms and phrases
acetate action alkaline alloy aluminium ammonia ammonium anode antimony battery bismuth black powder boiling brass cadmium carbonate cathode Chemical chloric acid coating colour containing copper corroded crystals cyanide of potassium cyanide of silver decomposed deposited metal dilute sulphuric acid dipped dissolved distilled water electric current electro-deposited electrodes electrolysis employed evolved Fahr film fluoride formed free cyanide fused gallon german-silver gilding grains gutta-percha heat hydrochloric acid hydrofluoric acid hydrogen iron lead liquid magnesium magneto-electric means mercury metallic deposit mixture mould nickel nitrate nitric acid obtained ounces oxide oxygen palladium piece plate platinum positive precipitate pure quantity received a deposit reguline salt saturated separate current set free simple immersion Smee's cells soda sodium solu soluble solution of chloride solution of cyanide solution of sulphate substances sulphate sulphate of copper sulphuric acid surface Tellurium terchloride thick tion vessel voltaic washed whilst wire zinc
Popular passages
Page 5 - 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 phenomenon of metallic reduction is an essential feature in...
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 16 - I felt assured that the deposited copper would eas1ly separate from the lead by the application of heat, from the different expansibility of the two metals. ' In this result I was not disappointed. When the heat of a spirit lamp was applied for a few seconds to the lead the copper impression came easily off.
Page 15 - ... 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, and deposited a thick coating of copper on its surface. Being desirous to take it off, I applied the heat of a spiritlamp to...
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.
Page 6 - ... 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 phenomenon of metallic reduction is an essential feature in the action of sustaining batteries, the effect, in this case, taking place on more extensive surfaces. But the form of voltaic apparatus which exhibits this result in the most...
Page 9 - 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 18 - 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 likewise...
Page 8 - It was compounded in the manner recommended by Dr. Faraday, in his work on Chemical Manipulation, but with a larger proportion of wax. The plate received its coating while hot.
Page 363 - when nitrate of silver is added to a solution of cyanide of potassium, so long as the precipitate formed is all redissolved, we obtain the whole of the cyanide of potassium in combination with the silver ; none of the other salts in solution take any part in the action, even though they be present in a large proportion. This enables us to test the exact quantity of cyanide of potassium in any sample.