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Furnace for processes where protracted heat required
Smelting of copper: making liquation cakes by
Assayer testing samples of gold or silver using
Distillation of Nitric Acid. Also known as Aqua
Assay laboratory for gold and silver
Assaying of silver in 1574. Copperplate engraving
Assaying copper in 1574. Copperplate engraving
Roasting gold ore in order to recover the precious
Assaying: Various muffles used in assay ovens
Smelting copper. From a 1683 Prague in 1574. Copperplate
Refining of silver, in Prague in 1574. Copperplate
Crystallization of Saltpetre (Nitre, Potassium
Checking the quality of Saltpetre (Nitre, Potassium
Athanor or Slow Harry, a self-feeding furnace
Athanor or Slow Harry, a self-feeding furnace
Production of Salpetre (Nitre, Potassium Nitrate
Washing ore to extract gold. Water is fed into
Preparation of copper and silver to be alloyed
Washing ore to extract gold. Water fed into sieve
Refining gold in Prague in 1574. Copperplate engraving
Laboratory for refining gold and silver, showing
Purification of silver in a muffle furnace. 1574
Assay laboratory with various forms of furnace
Assaying copper and lead: prepared and weighed ore
Recovery of gold from amalgum 1574. Copperplate engraving
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