Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="205"/>
              prone to motion as it revolves. </s>
              <s>And so, when the workman turns the axle
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              by the crank, the fans, the description of which I will give a little later, draw
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              in the air by the blow-hole, and force it through the other blow-hole which
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              leads to the conduit, and through this conduit the air penetrates into the
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              shaft.</s>
            </p>
            <p type="main">
              <s>The one with the box-shaped casing is furnished with just the same
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              things as the drum, but the drum is far superior to the box: for the fans so
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              fill the drum that they almost touch it on every side, and drive into the
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              conduit all the air that has been accumulated; but they cannot thus fill
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              the box-shaped casing, on account of its angles, into which the air partly
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              retreats; therefore it cannot be as useful as the drum. </s>
              <s>The kind with a
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              box-shaped casing is not only placed on the ground, but is also set up on timbers
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              like a windmill, and its axle, in place of a crank, has four sails outside,
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              like the sails of a windmill. </s>
              <s>When these are struck by the wind they turn
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              the axle, and in this way its fans—which are placed within the casing—drive </s>
            </p>
            <figure number="118"/>
            <p type="caption">
              <s>A—BOX-SHAPED CASING PLACED ON THE GROUND. B—ITS BLOW-HOLE. C—ITS AXLE
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              WITH FANS. D—CRANK OF THE AXLE. E—RODS OF SAME. F—CASING SET ON TIMBERS.
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              G—SAILS WHICH THE AXLE HAS OUTSIDE THE CASING.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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