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Assaying gold and silver bullion at the new york Assay Office. Weighing Room. Melting. Pressing the assay sample. Muffle furnaces for fire assay. Humid assay for silver. Extracting the silver with boiling acid.
Source: Steve Kirch, collector, and creator of a great website about SCIENTIFIC AMERICAN in the past
Restoration by: magscanner
- Created on
- Monday 15 March 2010
- Posted on
- Monday 15 March 2010
- Tags
- coin, composition, expensive, fortune, jewelry, metals, percentage, purity, quality, rare, value, wealth
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