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
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Image Number: 1746-1929Rights ManagedCredit Line:Image Asset Management/World History Archive/SuperStockCollection:Image Asset Management Model Release:NoProperty Release:NoResolution:3388×5705
