Assaying copper in 1574. Copperplate engraving.
Assaying copper: Furnaces (1,4), ore (3), bellows (5), and aeolipile (6) to supply draught to furnaces. Pot in which flux is prepared (8). From 1683 English edition of Lazarus Ercker 'Beschreibung allerfurnemisten mineralischen Ertzt- und Berckwercksarten' originally published in Prague in 1574. Copperplate engraving.