. De re metallica. Metallurgy; Mineral industries. BOOK VI. 207 sort is made of boards of the same width, but shorter, to which are bound long thin blades of poplar or some other flexible wood ; the third sort has boards like the last, to which are bound double and triple rows of goose feathers. This last is less used than the second, which in turn is less used than the first. The boards of the fan are mortised into the quadrangular parts of the barrel A—First kind of fan. B—Second kind of fan. C—Third kind of FAN. D—Quadrangular part of axle. E—Round part of same. F—Crank. Blowing mach
. De re metallica. Metallurgy; Mineral industries. BOOK VI. 207 sort is made of boards of the same width, but shorter, to which are bound long thin blades of poplar or some other flexible wood ; the third sort has boards like the last, to which are bound double and triple rows of goose feathers. This last is less used than the second, which in turn is less used than the first. The boards of the fan are mortised into the quadrangular parts of the barrel A—First kind of fan. B—Second kind of fan. C—Third kind of FAN. D—Quadrangular part of axle. E—Round part of same. F—Crank. Blowing machines of the third genus, which are no less varied and of no fewer forms than those of the second genus, are made with bellows, for by its blasts the shafts and tunnels are not only furnished with air through conduits or pipes, but they can also be cleared by suction of their heavy and pestilential vapours. In the latter case, when the bellows is opened it draws the vapours from the conduits through its blow-hole and sucks these vapours into itself ; in the former case, when it is compressed, it drives the air through its nozzle into the conduits or pipes. They are compressed either by a Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Agricola, Georg, 1494-1555; Hoover, Herbert, 1874-1964. New York, Dover Publications
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