Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="202"/>
            <figure number="115"/>
            <p type="caption">
              <s>A—PROJECTING MOUTH OF CONDUIT. B—PLANKS FIXED TO THE MOUTH OF THE CONDUIT
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              WHICH DOES NOT PROJECT.
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              feet high and three feet in diameter, bound with wooden hoops; it has a
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              square blow-hole always open, which catches the breezes and guides them
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              down either by a pipe into a conduit or by many pipes into the shaft. </s>
              <s>To
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              the top of the upper pipe is attached a circular table as thick as
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              the bottom of the barrel, but of a little less diameter, so that the barrel may be
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              turned around on it; the pipe projects out of the table and is fixed in a
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              round opening in the centre of the bottom of the barrel. </s>
              <s>To the end of the
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              pipe a perpendicular axle is fixed which runs through the centre of the barrel
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              into a hole in the cover, in which it is fastened, in the same way as at the
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              bottom. </s>
              <s>Around this fixed axle and the table on the pipe, the movable
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              barrel is easily turned by a zephyr, or much more by a wind, which govern
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              the wing on it. </s>
              <s>This wing is made of thin boards and fixed to the upper
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              part of the barrel on the side furthest away from the blow-hole; this, as I
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              have said, is square and always open. </s>
              <s>The wind, from whatever quarter of </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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