Agricola, Georgius, De re metallica, 1912/1950

List of thumbnails

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              <s>
                <pb pagenum="368"/>
              for each separate plank is placed outside of the posts. </s>
              <s>The third is at the
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              same distance from the fourth, but the second is one foot and three digits
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              distant from the third. </s>
              <s>In the same manner the rest of the eight planks are
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              arranged at intervals, the fifth from the sixth and the seventh from the eighth
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              are at the same distances as the first from the second and the third from the
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              fourth; the sixth is at the same distance from the seventh as the second
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              from the third.</s>
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              <s>Two planks support one transverse plank six feet long, one foot wide, one
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              palm thick, placed at a distance of three feet and two palms from the back
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              posts. </s>
              <s>When there are six of these supporting planks, on each separate one
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              are placed two bellows; the lower bellows-boards project a palm beyond
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              them. </s>
              <s>From each of the bellows-boards an iron ring descends through a hole
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              in its supporting plank, and a wooden peg is driven into the ring, so that the
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              bellows-board may remain stationary, as I stated above.</s>
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              <s>The two bellows communicate, each by its own plank, to the back of a
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              copper pipe in which are set both of the nozzles, and their ends are tightly </s>
            </p>
            <figure number="213"/>
            <p type="caption">
              <s>A—FRONT SILL. B—BACK SILL. C—FRONT POSTS. D—THEIR SLOTS. E—BEAM
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              IMPOSED UPON THEM. F—HIGHER POSTS. G—THEIR SLOTS. H—BEAM IMPOSED UPON
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              THEM. I—TIMBER JOINED IN THE MORTISES OF THE POSTS. K—PLANKS. L—TRANSVERSE
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              SUPPORTING PLANKS. M—THE HOLES IN THEM. N—PIPE. O—ITS FRONT END. P—ITS
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              REAR END.</s>
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