Old Mining Pictures Underground

Old Mining Pictures Underground

Bewetterung9 Supply of fresh air in the underground mining over different stages at the top with a horses furniture operating bellows translation on a cogwheel and at the bottom via a pedal mechanism moving bellows woodcut S 169 Liber sextus Manuel Hans Rudolf graveur sur bois 1556 Georgius Agricola De re metallica libri XII quibus officia instrumenta machinae ac omnia.

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