Agricola, Georgius, De re metallica, 1912/1950

Table of figures

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="207"/>
              sort is made of boards of the same width, but shorter, to which are bound
                <lb/>
              long thin blades of poplar or some other flexible wood; the third sort has
                <lb/>
              boards like the last, to which are bound double and triple rows of goose
                <lb/>
              feathers. </s>
              <s>This last is less used than the second, which in turn is less used
                <lb/>
              than the first. </s>
              <s>The boards of the fan are mortised into the quadrangular
                <lb/>
              parts of the barrel axle.</s>
            </p>
            <figure number="120"/>
            <p type="caption">
              <s>A—FIRST KIND OF FAN. B—SECOND KIND OF FAN. C—THIRD KIND OF
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              FAN. D—QUADRANGULAR PART OF AXLE. E—ROUND PART OF SAME.
                <lb/>
              F—CRANK.</s>
            </p>
            <p type="main">
              <s>Blowing machines of the third genus, which are no less varied and of no
                <lb/>
              fewer forms than those of the second genus, are made with bellows, for by its
                <lb/>
              blasts the shafts and tunnels are not only furnished with air through conduits
                <lb/>
              or pipes, but they can also be cleared by suction of their heavy and pestilential
                <lb/>
              vapours. </s>
              <s>In the latter case, when the bellows is opened it draws the
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              vapours from the conduits through its blow-hole and sucks these vapours
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              into itself; in the former case, when it is compressed, it drives the air through
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              its nozzle into the conduits or pipes. </s>
              <s>They are compressed either by a man, </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum