Agricola, Georgius
,
De re metallica
,
1912/1950
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prone to motion as it revolves. </
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<
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>And so, when the workman turns the axle
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by the crank, the fans, the description of which I will give a little later, draw
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in the air by the blow-hole, and force it through the other blow-hole which
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leads to the conduit, and through this conduit the air penetrates into the
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shaft.</
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>The one with the box-shaped casing is furnished with just the same
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things as the drum, but the drum is far superior to the box: for the fans so
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fill the drum that they almost touch it on every side, and drive into the
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conduit all the air that has been accumulated; but they cannot thus fill
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the box-shaped casing, on account of its angles, into which the air partly
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retreats; therefore it cannot be as useful as the drum. </
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>The kind with a
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box-shaped casing is not only placed on the ground, but is also set up on timbers
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like a windmill, and its axle, in place of a crank, has four sails outside,
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like the sails of a windmill. </
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<
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>When these are struck by the wind they turn
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the axle, and in this way its fans—which are placed within the casing—drive </
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>A—BOX-SHAPED CASING PLACED ON THE GROUND. B—ITS BLOW-HOLE. C—ITS AXLE
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WITH FANS. D—CRANK OF THE AXLE. E—RODS OF SAME. F—CASING SET ON TIMBERS.
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G—SAILS WHICH THE AXLE HAS OUTSIDE THE CASING.</
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