Stock Photo: Mine ventilation. Hollow wooden drum, top, which had two blowholes opposite each other on the circumference, C, one to suck in air and one to expel it as the drum rotated. Inside the drum, fixed to axle on which it rotated, were fans made of wood or of wood and goose quills. HHHH are rods attached t

1746-1929 Rights Managed
  • Model Release: No
  • Property Release: No

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  • 11.29" x 19.01"
  • 300 dpi
  • 55.24MB
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