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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Image Number: 1746-1907Rights ManagedCredit Line:Image Asset Management/World History Archive/SuperStockCollection:Image Asset Management Model Release:NoProperty Release:NoResolution:4332×4132