Hollowed tree trunk is used for gold washing, A long hollowed out tree trunk is buried in the bottom of a stream to gain gold, rarely used, woodcut, p. 268, (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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Hollowed tree trunk is used for gold washing, A long hollowed out tree trunk is buried in the bottom of a stream to gain gold, rarely used, woodcut, p. 268, (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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