Assaying copper and lead: prepared and weighed ore (1) and assay oven (2). From 1683 English edition of Lazarus Ercker 'Beschreibung allerfurnemisten mineralischen Ertzt- und Berckwercksarten' originally published in Prague in 1574. Copperplate engraving

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Assaying copper and lead: prepared and weighed ore (1) and assay oven (2). From 1683 English edition of Lazarus Ercker 'Beschreibung allerfurnemisten mineralischen Ertzt- und Berckwercksarten' originally published in Prague in 1574. Copperplate engraving

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Photo credit: © World History Archive / Alamy / Afripics
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