Mine ventilation. (Basle, 1556). Woodcut

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 to the axle and which acted as a flywheel. Hollow box, bottom, similar to the drum above, but not considered to be as efficient. From De re metallica, by Agricola, pseudonym of Georg Bauer (Basle, 1556). Woodcut

Restrictions Only for Ireland and United Kingdom

1556 Acted Agricola Axle Basle Bauer Circumference Considered Efficient Expel Fixed Flywheel Goose Hollow Metallica Opposite Pseudonym Quills Rods Rotate Rotated Similar Suck Ventilation

Features In These Collections

> Contributors > WHA