Revolving wooden wind vanes fitted to the top of mine ventilation shafts. When they revolved they acted as extractor fans sucking stale air from the mine. From 'De re metallica', by Agricola, pseudonym of Georg Bauer (Basle, 1556). Woodcut.

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Revolving wooden wind vanes fitted to the top of mine ventilation shafts. When they revolved they acted as extractor fans sucking stale air from the mine. From 'De re metallica', by Agricola, pseudonym of Georg Bauer (Basle, 1556). Woodcut.

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

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