. De re metallica. Metallurgy; Mineral industries. 368 BOOK IX. for each separate plank is placed outside of the posts. The third is at the same distance from the fourth, but the second is one foot and three digits distant from the third. In the same manner the rest of the eight planks are arranged at intervals, the fifth from the sixth and the seventh from the eighth are at the same distances as the lirst from the second and the third from the fourth ; the sixth is at the same distance from the seventh as the second from the third. Two planks support one transverse plank six feet long, one fo
. De re metallica. Metallurgy; Mineral industries. 368 BOOK IX. for each separate plank is placed outside of the posts. The third is at the same distance from the fourth, but the second is one foot and three digits distant from the third. In the same manner the rest of the eight planks are arranged at intervals, the fifth from the sixth and the seventh from the eighth are at the same distances as the lirst from the second and the third from the fourth ; the sixth is at the same distance from the seventh as the second from the third. Two planks support one transverse plank six feet long, one foot wide, one palm thick, placed at a distance of three feet and two palms from the back posts. When there are six of these supporting planks, on each separate one are placed two bellows ; the lower bellows-boards project a palm beyond them. From each of the bellows-boards an iron ring descends through a hole in its supporting plank, and a wooden peg is driven into the ring, so that the bellows-board may remain stationary, as I stated above. The two bellows communicate, each by its own plank, to the back of a copper pipe in which are set both of the nozzles, and their ends are tightly. A—Front sill. B—Back sill. C—Front posts. D—Their slots. E—Beam IMPOSED UPON THEM. F—HiGHER POSTS. G—ThEIR SLOTS. H—BeAM IMPOSED UPON THEM. I—Timber joined in the mortises of the posts. K—Planks. L—Transverse SUPPORTING PLANKS. M—ThE HOLES IN THEM. N—PiPE. 0—ITS FRONT END. P—ItS rear 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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