Items related to Cooley's Cyclopaedia of Practical Receipts and...
Cooley's Cyclopaedia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades, Including Medicine, ... as a Comprehensive Supplement to the Volume 2 - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ...and gradually becoming contaminated with secondary products. The character of the deposit of platinum is naturally impoverished by such alterations in the conditions. All the solutions recommended for electro-plating, except Boettger's, which is the double chloride of ammonium and platinum in sodium citrate, are made by treating the platinic chloride with alkaline salts, the most favoured of which are the phosphates and oxalates. The result is a solution of the douhle phosphate or oxalate, as the case may be, together with the chloride of the alkali from the decomposition of the platinic chloride. As the solution becomes impoverished it is strengthened by fresh additions of platinic chloride, with the result that the alkaline chloride accumulates until the bath is practically spoilt. Boettger maintains his bath by fresh additions of the original solution, but here again the accumulation of foreign substances must follow. W. H. Waul, who has been investigating the question of the best method for the electro-deposition of platinum, states in a recent issue of the 'Journal of the Franklin Institute' that with an alkaline platinate solution, an oxalate solution or a phosphate solution may be used. Solution of platinic hydrate in caustic potash will give a good deposit of metal, and the bath may be kept up to a standard by additions of platinic hydrate without any deterioration due to the accumulation of foreign salts. He recommends a solution of platinic hydrate in the preparation and maintenance of the strength of the ordinary solution in use, and gives the following directions: The Alkaline Platinate Solution. Platinic hydrate, 2 oz. j caustic potash, 8 oz.; distilled water, 1 gall. One half of the caustic potash is dissolved in a quart of...
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