. De re metallica. Metallurgy; Mineral industries. BOOK VI. 203 the world it blows, drives the wing straight toward the opposite direction, in which way the barrel turns the blow-hole towards the wind itself ; the blow-hole receives the wind, and it is guided down into the shaft by means of the conduit or A—Wooden E—Table. BARRELS. F—Axle. -Hoops. C—Blow-holes. D—Pipe. -Opening in the bottom of the barrel. H—Wing. The second genus of blowing machine is made with fans, and is likewise varied and of many forms, for the fans are either fitted to a windlass barrel or to an axle. If to an a
. De re metallica. Metallurgy; Mineral industries. BOOK VI. 203 the world it blows, drives the wing straight toward the opposite direction, in which way the barrel turns the blow-hole towards the wind itself ; the blow-hole receives the wind, and it is guided down into the shaft by means of the conduit or A—Wooden E—Table. BARRELS. F—Axle. -Hoops. C—Blow-holes. D—Pipe. -Opening in the bottom of the barrel. H—Wing. The second genus of blowing machine is made with fans, and is likewise varied and of many forms, for the fans are either fitted to a windlass barrel or to an axle. If to an axle, they are either contained in a hollow drum, which is made of two wheels and a number of boards joining them together, or else in a box-shaped casing. The drum is stationary and closed on the sides, except for round holes of such size that the axle may turn in them; it has two square blow-holes, of which the upper one receives the air, while the lower one empties into the conduit through which the air is led down the shaft. The ends of the axle, which project on each side of the drum, are supported by forked posts or hollowed beams plated with thick iron ; one end of the axle has a crank, while in the other end are fixed four rods with thick heavy ends, so that they weight the axle, and when turned, make it. 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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