Washing the ores_2, During washing, the metals are removed from the ores, in addition there are different methods, simple trenches or trenches graduated with boards, woodcut, S. 237, (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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Washing the ores_2, During washing, the metals are removed from the ores, in addition there are different methods, simple trenches or trenches graduated with boards, woodcut, S. 237, (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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