Agricola, Georgius
,
De re metallica
,
1912/1950
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>A—PROJECTING MOUTH OF CONDUIT. B—PLANKS FIXED TO THE MOUTH OF THE CONDUIT
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WHICH DOES NOT PROJECT.
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feet high and three feet in diameter, bound with wooden hoops; it has a
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square blow-hole always open, which catches the breezes and guides them
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down either by a pipe into a conduit or by many pipes into the shaft. </
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>To
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the top of the upper pipe is attached a circular table as thick as
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the bottom of the barrel, but of a little less diameter, so that the barrel may be
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turned around on it; the pipe projects out of the table and is fixed in a
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round opening in the centre of the bottom of the barrel. </
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>To the end of the
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pipe a perpendicular axle is fixed which runs through the centre of the barrel
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into a hole in the cover, in which it is fastened, in the same way as at the
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bottom. </
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>Around this fixed axle and the table on the pipe, the movable
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barrel is easily turned by a zephyr, or much more by a wind, which govern
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the wing on it. </
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>This wing is made of thin boards and fixed to the upper
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part of the barrel on the side furthest away from the blow-hole; this, as I
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have said, is square and always open. </
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>The wind, from whatever quarter of </
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