Roasting 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 (graveur sur bois), 1556, Georgius Agricola: De re metallica libri XII: quibus officia, instrumenta, machinae, ac omnia denique ad metallicam spectantia, non modo luculentissime describuntur, sed & per effigies (...). Basileae: [Froben], 1556

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Roasting 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 (graveur sur bois), 1556, Georgius Agricola: De re metallica libri XII: quibus officia, instrumenta, machinae, ac omnia denique ad metallicam spectantia, non modo luculentissime describuntur, sed & per effigies (...). Basileae: [Froben], 1556.

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