Ventilating a mine. Hollow drum with air holes, B, at opposite sides, mounted on an axle, C, to which are fixed fans rotating inside the drum. Axle turned by water wheel through a spur gear and lantern. When axle turned, the fans rotating inside the drum would suck air in one hole and out of the opposite one, setting up a current of air. From De re metallica, by Agricola, pseudonym of Georg Bauer (Basle, 1556). Woodcut.
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Creative#:
TOP09159519
Source:
達志影像
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RM
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須由TPG 完整授權
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