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Ercker Photos ❘ Science Photo Library
12903721 - Self-feeding furnace, 1683
12903332 - Assayer testing samples using a balance, 1683
12903722 - Self-feeding furnace, 1683
12903726 - Checking the quality of saltpetre, 1683
12903719 - Washing ore to extract gold, 1683
12903435 - Preparation of copper and silver, 1683
12916171 - Refining copper using the 'Hungarian' process, 1683
12915253 - Smelting of copper, 1683
12916172 - Assayer testing samples of gold and silver, 1683
12903727 - Crystallization of saltpetre, 1683
12903724 - Laboratory for refining gold and silver, 1683
12903720 - Furnace, 1580
12903725 - Production of saltpetre, 1683
12903723 - Distillation of Nitric Acid, 1683
12916170 - Blast furnaces, 1683
12915285 - Washing ore to extract gold, 1683
11726533 - Refining gold
11726522 - Refining of silver
11726519 - Assaying
11726532 - Purification of silver in a furnace
11726520 - Recovery of gold from amalgum
11721496 - Washing ore to extract gold
11726531 - Assay laboratory
11726523 - Roasting gold ore to recover the metal
11726534 - Assay laboratory for gold and silver
11721482 - Smelting of copper
11726521 - Assaying copper and lead
11726524 - Assaying copper
11726518 - Smelting copper
11726525 - Assaying of silver
11904805 - Manufacture of saltpetre for use in gunpowder
12016032 - Purifying Silver
12016033 - Purifying Silver
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