Assay laboratory with various forms of furnace

Assay laboratory with various forms of furnace including and athanor or Slow Harry, 7, self-stoking furnace for cementation, 9, and barrel-shaped furnace, 3, in which draught supplied by steam from water in container placed over hot charcoals. At 4 a crucible is being gradually heated in a ring of burning coals: to increase the heat coals could be raked into a smaller circle. From 1683 English edition of Lazarus Ercker Beschreibung allerfurnemisten mineralischen Ertzt- und Berckwercksarten originally published in Prague in 1574. Copperplate engraving

1574 1683 Allerfurnemisten Assay Athanor Berckwercksarten Beschreibung Cementation Charcoal Charcoals Coals Container Crucible Draught Ercker Ertzt Forms Furnace Gradually Heated Increase Lazarus Metallurgy Mineralischen Placed Raked Slow Smaller Supplied

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