The silversmith's handbook : containing full instructions for the alloying and working of silver, including the different modes of refining and melting the metal; its solders; the preparation of imitation . r the purpose of imparting a greaterdegree of whiteness to them, as well as renderinginferior silver more easily bleached or whitened ;thus assisting to bring back the natural colour offine silver to manufactured articles, which havepartially lost it by the addition of alloy of someother colour. Zinc, when employed in silveralloys, should be cautiously used, and care shouldbe take
The silversmith's handbook : containing full instructions for the alloying and working of silver, including the different modes of refining and melting the metal; its solders; the preparation of imitation . r the purpose of imparting a greaterdegree of whiteness to them, as well as renderinginferior silver more easily bleached or whitened ;thus assisting to bring back the natural colour offine silver to manufactured articles, which havepartially lost it by the addition of alloy of someother colour. Zinc, when employed in silveralloys, should be cautiously used, and care shouldbe taken not to add too much to a given quantityof material. The solder used with silver-zincalloys should be far more fusible than that em-ployed with the other alloys. If too much zinc beadded in the preparation of these alloys, in thecourse of the work, particularly in the process ofsoldering, they have a tendency to sweat, and some-times to eat the metals into holes around the partsto be united; such alloys, therefore, render thisprocess very difficult to perform, besides entailingmore labour in the production of a clean and smoothfinish. In melting an alloy of silver, copper, and zinc. ZINC IN SILVER ALLOYS. 99. the silver and copper should first be melted in aplumbago crucible of the form shown in Fig i8,and well stirred together in order that theymay become properly zinc is sold in flatcakes under the name of spel-ter, and, when required, isusually cut up with a chiselinto pieces of various weightssuitable for the object in the copper and silverhave become well incorporated,the mixture should be pro-tected from the air by asuitable flux, charcoal being the best for this pur-pose. The most suitable time to add it to thecrucible in the furnace is when the metals arejust beginning to fuse. This flux covers thewhole of the surface of the molten mass, and soprevents the action of the air from destroying someof the baser metal. The charcoal should be per-fectly pu
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsilverw, bookyear1921
