Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="209"/>
              closed. </s>
              <s>The bellows, by the first method, blows fresh air into the conduit
                <lb/>
              through its nozzle, and by the second method blows out through the nozzle
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              the heavy and pestilential vapours which have been collected. </s>
              <s>In this
                <lb/>
              latter case fresh air enters through the larger part of the shaft, and the miners
                <lb/>
              getting the benefit of it can sustain their toil. </s>
              <s>A certain smaller part of the
                <lb/>
              shaft which forms a kind of estuary, requires to be partitioned off from the
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              other larger part by uninterrupted lagging, which reaches from the top of the
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              shaft to the bottom; through this part the long but narrow conduit reaches
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              down nearly to the bottom of the shaft.</s>
            </p>
            <p type="main">
              <s>When no shaft has been sunk to such depth as to meet a tunnel driven
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              far into a mountain, these machines should be built in such a manner that
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              the workman can move them about. </s>
              <s>Close by the drains of the tunnel
                <lb/>
              through which the water flows away, wooden pipes should be placed and
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              joined tightly together in such a manner that they can hold the air; these
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              should reach from the mouth of the tunnel to its furthest end. </s>
              <s>At the mouth
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              of the tunnel the bellows should be so placed that through its nozzle it can
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              blow its accumulated blasts into the pipes or the conduit; since one blast </s>
            </p>
            <figure number="122"/>
            <p type="caption">
              <s>A—TUNNEL. B—PIPE. C—NOZZLE OF DOUBLE BELLOWS.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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