Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="206"/>
              the air through the blow-hole and the conduit into the shaft. </s>
              <s>Although
                <lb/>
              this machine has no need of men whom it is necessary to pay to work the
                <lb/>
              crank, still when the sky is devoid of wind, as it often is, the machine does
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              not turn, and it is therefore less suitable than the others for ventilating a shaft.</s>
            </p>
            <p type="main">
              <s>In the kind where the fans are fixed to an axle, there is generally a
                <lb/>
              hollow stationary drum at one end of the axle, and on the other end is fixed
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              a drum made of rundles. </s>
              <s>This rundle drum is turned by the toothed wheel
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              of a lower axle, which is itself turned by a wheel whose buckets receive the
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              impetus of water. </s>
              <s>If the locality supplies an abundance of water this
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              machine is most useful, because to turn the crank does not need men
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              who require pay, and because it forces air without cessation through the
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              conduit into the shaft.</s>
            </p>
            <figure number="119"/>
            <p type="caption">
              <s>A—HOLLOW DRUM. B—ITS BLOW-HOLE. C—AXLE WITH FANS. D—DRUM
                <lb/>
              WHICH IS MADE OF RUNDLES. E—LOWER AXLE. F—ITS TOOTHED WHEEL.
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              G—WATER WHEEL.</s>
            </p>
            <p type="main">
              <s>Of the fans which are fixed on to an axle contained in a drum or box,
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              there are three sorts. </s>
              <s>The first sort is made of thin boards of such length
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              and width as the height and width of the drum or box require; the second </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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