This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...able easily to dissolve the anode under the influence of the current, and (8) able to yield a regular deposit. While not all these conditions may be obtained in every solution, special precautions can be taken to remedy defects due to their absence. Solutions should be stirred frequently, preferably at the end of a day ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...able easily to dissolve the anode under the influence of the current, and (8) able to yield a regular deposit. While not all these conditions may be obtained in every solution, special precautions can be taken to remedy defects due to their absence. Solutions should be stirred frequently, preferably at the end of a day's work; for working a solution tends to produce in it a varying density, by which the deposits will be materially affected. In case of thick and quick deposits, the solutions require to be kept in slight motion. This can be effected by (1) imparting a slow movement to the electrodes; (2) the use of moving paddles in the solution; (3) allowing the solution to trickle through a series of vats arranged in step fashion. Copper.--For copper-plating on brass (and other metals and alloys which do not deposit copper by simple immersion), for electrotyping on wax, guttapercha, and various compositions, and for copper refining, copper sulphate is widely used, its solution being simple in composition, and not prone to much change. For most purposes 2 lbs. copper sulphate (crystals), 'A pint sulphuric acid, 1 gal. water, makes a good solution, the presence of the acid greatly facilitating the passage of the current and improving the quality of the deposit. As already pointed out, base metals, such as iron, zinc, and tin cannot be plated in a simple acid copper sulphate solution. Solutions for this purpose are generally made up from a copper salt, such as cupric sulphate, and potassium cyanide, with the addition of other agents, as sodium carbonate, sodium sulphate, and the like. The exact solution used varies with individual conditions. The following solution is said to give good results when used at a temperature of 130-140 F. Dissolve lb. copper sulpha...
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Add this copy of Nelson's Encyclopaedia: Everybody's Book of Reference.. to cart. $91.08, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2011 by Nabu Press.
