EditorialToasting the ores_3, Preparation and construction of the woodpile for the toasting stick, woodcut, p. 215, (Liber octavus), Manuel, Hans Rudolf (graveur sur bois), 1556, Georgius Agricola: De re metallica libri XII: quibus officia, instrumenta, machina...
EditorialRoasting the ores_4, Lead ores are roasted in an inclined toasting jaw, so that the lead-based paints can drain off, on the vault of the roasting oven put on ingredients that can be recycled, woodcut, p. 216, (Liber octavus), Manuel, Hans Rudolf (grave...