The practical electroplater A comprehensive treatise on electroplating, with notes on ancient and modern gilding, and formulas for new solutions . metallic powders, all of which have beenunsuccessful, either from a lack of proper adhesion to thewax mold or from the solvent action on the powders bythe solution in the vat. While all efforts to supplant plumbago by means ofmetallic powders have been unsuccessful, it remained forSilas Knight, of New York, to discover a means wherebyan instantaneous coating of metallic copper is thrown 224 THE PRACTICAL ELECTROPLATER. down on the plumbago film befo
The practical electroplater A comprehensive treatise on electroplating, with notes on ancient and modern gilding, and formulas for new solutions . metallic powders, all of which have beenunsuccessful, either from a lack of proper adhesion to thewax mold or from the solvent action on the powders bythe solution in the vat. While all efforts to supplant plumbago by means ofmetallic powders have been unsuccessful, it remained forSilas Knight, of New York, to discover a means wherebyan instantaneous coating of metallic copper is thrown 224 THE PRACTICAL ELECTROPLATER. down on the plumbago film before the mold is placedin the vat. Murrays suggestion made it possible to coat non-con-ducting material with a conducting surface, while Knightsdiscovery, when used in connection with the plumbago film,materially reduces the time of the deposit, as the mold isthereby provided with a surface of an eminent conductingquality, by which means the uniformity of the deposit overthe entire surface is insured. Without such preparation thedeposit of copper would take place slowly, and graduallyspread itself over the surface of the mold. Those portions. Line Holders. nearest the connections would therefore receive the heaviestdeposit, and those farthest therefrom the thinnest. When used in connection with the plumbago film, themetallizing process effects in a few seconds a uniform coat-ing of metallic copper over the face of the mold, thereby in-suring a uniform and rapid deposit on the mold in the vat. Striking Solution. This solution is used in metallizing the molds, and iscomposed of 2 pounds of sulphate of copper crystals to eachgallon of water. Do not add sulphuric acid to this solu-tion, as it will cause the iron filings to heat, and burn theface of the mold. STRIKING SOLUTION. 225 The operation of metallizing the mold is performed inthe following manner : After the superfluous blacklead isblown out of the cavities, the mold is laid face up on a levelshelf in a sink or trough. The ope
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisheretcetc, bookyear189
