THE NEW YORK ASSAY OFFICE—XELTING AND REFINING. Stamping $8000 Gold Bars with Fineness Weight and Value. Concentrating the Silver Solution and Precipitating the Silver. Separating the Gold from the Silver by Boiling with Sulphuric Acid. Stamping Value Weight and Fineness on Silver Bars. Pressing Precipitated Silver into 'Cheeses.' THE NEW YORK ASSAY OFFICE—MELTING AND REFINING., scientific american, 02-03-15
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