Agricola, Georgius
,
De re metallica
,
1912/1950
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sort is made of boards of the same width, but shorter, to which are bound
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long thin blades of poplar or some other flexible wood; the third sort has
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boards like the last, to which are bound double and triple rows of goose
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feathers. </
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>This last is less used than the second, which in turn is less used
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than the first. </
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>The boards of the fan are mortised into the quadrangular
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parts of the barrel axle.</
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>A—FIRST KIND OF FAN. B—SECOND KIND OF FAN. C—THIRD KIND OF
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FAN. D—QUADRANGULAR PART OF AXLE. E—ROUND PART OF SAME.
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F—CRANK.</
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>Blowing machines of the third genus, which are no less varied and of no
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fewer forms than those of the second genus, are made with bellows, for by its
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blasts the shafts and tunnels are not only furnished with air through conduits
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or pipes, but they can also be cleared by suction of their heavy and pestilential
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vapours. </
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>In the latter case, when the bellows is opened it draws the
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vapours from the conduits through its blow-hole and sucks these vapours
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into itself; in the former case, when it is compressed, it drives the air through
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its nozzle into the conduits or pipes. </
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>They are compressed either by a man, </
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