Lazarus Ercker Prints

Smelting of copper, 1683
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Preparation of copper and silver to be alloyed for production of coins, 1683
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Crystallization of saltpetre (nitre, potassium nitrate, or KN03), 1683
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Checking the quality of saltpetre (nitre, potassium nitrate, or KN03), 1683
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Laboratory for refining gold and silver, showing typical laboratory equipment, 1683
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Production of saltpetre (nitre, potassium nitrate, or KN03), 1683
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Distillation of Nitric Acid, 1683
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Athanor or Slow Harry, a self-feeding furnace maintaining a constant temperature, 1683
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Furnace for processes where protracted heat required, such as cementation, 1580
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Washing ore to extract gold, 1683
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Assayer testing samples of gold or silver using a balance, 1683. Artist: Lazarus Ercker
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Assayer testing samples of gold and silver, 1683
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Refining copper using the Hungarian process, 1683
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Blast furnaces, 1683
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