Metal-work; a handbook for teachers and students (1914)
Adam, Hugh M. [from old catalog], Evans, James Humphrey, [from old catalog] joint author · New York, Longmans, Green and co.; London, E. Arnold · leaf 70
ization. Lead free from silveralways separates out in crystals,leaving a rich alloy. This alloy,frequently containing from 300 to700 ounces of silver per ton, is thencupelled. Cupellation was the originalmethod of extracting silver, and wasnot profitable where the percentagewas small. By this… … Tuyere Fig. 15.—Lead Slag-Hearth. Tin.—In order to prepare tin from its ores (tinstone or tindioxide), the ore is first crushed, and then washed to removethe gangue. This is frequently done by running water, andis termed tin-streaming. It is then roasted to eliminatearsenic and sulphur. This…
Metal-work
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