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Scientific American, Vol. 44, No. 22 (May 1881) (1881)

leaf 4

An illustration from Scientific American, Vol. 44, No. 22 (May 1881), 1881, leaf 4
on of gold or silver or any borax glass, boracic acid, bicarbonate alloy of these. By too high a heat or of soda, salt, carbonate of ammonia, overlong exposure in the crucible there fine bone ash, and white silicious sand is apt to be a loss of silver through vola- (silica), nitric acid (pure).… … and one inch deep, placed parallel at a and this in turn placed in a small cor- distance equal to their width, and sol net of lead foil and placed in a clean APPARATUS FOB. ASSAYING. dered at the ends to a tin or wireframe hot cupel, where it melts and alloys; the lead soon slags out and the but-…

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