Agricola, Georgius
,
De re metallica
,
1912/1950
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the world it blows, drives the wing straight toward the opposite direction, in
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which way the barrel turns the blow-hole towards the wind itself; the
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blow-hole receives the wind, and it is guided down into the shaft by means
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of the conduit or pipes.</
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>A—WOODEN BARRELS. B—HOOPS. C—BLOW-HOLES. D—PIPE.
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E—TABLE. F—AXLE. G—OPENING IN THE BOTTOM OF THE BARREL.
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H—WING.</
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>The second genus of blowing machine is made with fans, and is likewise
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varied and of many forms, for the fans are either fitted to a windlass barrel
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or to an axle. </
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>If to an axle, they are either contained in a hollow drum,
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which is made of two wheels and a number of boards joining them together,
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or else in a box-shaped casing. </
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>The drum is stationary and closed on the
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sides, except for round holes of such size that the axle may turn in them;
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it has two square blow-holes, of which the upper one receives the air, while
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the lower one empties into the conduit through which the air is led down the
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shaft. </
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>The ends of the axle, which project on each side of the drum, are
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supported by forked posts or hollowed beams plated with thick iron; one
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end of the axle has a crank, while in the other end are fixed four rods with
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thick heavy ends, so that they weight the axle, and when turned, make it </
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