Stock Photo: Mine ventilation shaft topped with a device to extract the stale air from the mine. H is a vane to make the barrel revolve so that is always facing in the optimum wind direction. From De re metallica, by Agricola, pseudonym of Georg Bauer,Basle 1556,

1746-1909 Rights Managed
  • Model Release: No
  • Property Release: No

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  • 14.48" x 13.95"
  • 300 dpi
  • 51.99MB
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