File:The practical electroplater. A comprehensive treatise on electroplating, with notes on ancient and modern gilding, and formulas for new solutions (1894) (14759994506).jpg

Identifier: practicalelectro00brun (find matches)
Title: The practical electroplater. A comprehensive treatise on electroplating, with notes on ancient and modern gilding, and formulas for new solutions
Year: 1894 (1890s)
Authors: Brunor, Martin
Subjects: Electroplating Gilding
Publisher: New York, E. Brunor (etc., etc.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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n bronze. The heavy coating on the paperabsorbs the size, so that the bronze will not stick. This canbe obviated by running the sheets twice through the press,using size each time and allowing it to dry after the firstimpression, which it will do very quickly. The first print-ing fills up the pores in the paper, leaving an excellentground for the second impression, to which the bronze willadhere firmly. The extra cost of the double working shouldof course be taken into consideration in estimating the ex-pense of the work. The Molding Case. Some molders use a brass molding case with a rimabout an eighth of an inch deep, while the modern methodis to mold in a flat or rimless case. The latter is superiorto the old method both as regards economy and results, asthe flat case can be cast at a trifling cost from electrotypemetal in use in the foundry, and can be shaved to the de-sired thickness.on the ordinary shaving machine. Shouldthe flat case get out of true or become damaged in any way,
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Routing Machine. SHAVING THE WAX CASE. 209 it may be thrown back into the metal pot and a new casecast at leisure. Filling the Case. The molding case, having been slightly warmed, isplaced on a level iron table and surrounded by guardsabout an eighth of an inch higher than the case. The waxis now poured on the case with a warm ladle through a finesieve, in order to prevent the wax from chilling and also tokeep out any foreign substances that may have fallen intothe wax pot. The operator immediately draws a gas flameor a heated round iron rod slowly over the wax to wipe offthe air bubbles that rise to the surface. If the water is notthoroughly boiled out of the wax, a heated building iron orgas flame is passed over its surface, in order to evaporateany remaining moisture. After the wax has set, but whilestill warm, the guards should be relieved from the sides ofthe case, and all adhering wax scraped therefrom, thatthey may be ready for immediate or future use. Shouldthe wax shrink away

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