Stock Photo: Ventilating a mine. Various forms of fan which could be mounted on an axle inside a ventilating drum. A) Thin boards forming paddles. B) Short boards with feather shaped pieces of supple wood fixed on them. C) Short boards fitted with goose feathers., From De re metallica, by Agricola, pseudonym of

1746-1908 Rights Managed
  • Model Release: No
  • Property Release: No

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  • 14.44" x 13.47"
  • 300 dpi
  • 50.07MB
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