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Scientific American 1902-02-15
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Created on
Monday 15 March 2010
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coin
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composition
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expensive
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Scientific American
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
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