Agricola, Georgius, De re metallica, 1912/1950

Table of figures

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="203"/>
              the world it blows, drives the wing straight toward the opposite direction, in
                <lb/>
              which way the barrel turns the blow-hole towards the wind itself; the
                <lb/>
              blow-hole receives the wind, and it is guided down into the shaft by means
                <lb/>
              of the conduit or pipes.</s>
            </p>
            <figure number="116"/>
            <p type="caption">
              <s>A—WOODEN BARRELS. B—HOOPS. C—BLOW-HOLES. D—PIPE.
                <lb/>
              E—TABLE. F—AXLE. G—OPENING IN THE BOTTOM OF THE BARREL.
                <lb/>
              H—WING.</s>
            </p>
            <p type="main">
              <s>The second genus of blowing machine is made with fans, and is likewise
                <lb/>
              varied and of many forms, for the fans are either fitted to a windlass barrel
                <lb/>
              or to an axle. </s>
              <s>If to an axle, they are either contained in a hollow drum,
                <lb/>
              which is made of two wheels and a number of boards joining them together,
                <lb/>
              or else in a box-shaped casing. </s>
              <s>The drum is stationary and closed on the
                <lb/>
              sides, except for round holes of such size that the axle may turn in them;
                <lb/>
              it has two square blow-holes, of which the upper one receives the air, while
                <lb/>
              the lower one empties into the conduit through which the air is led down the
                <lb/>
              shaft. </s>
              <s>The ends of the axle, which project on each side of the drum, are
                <lb/>
              supported by forked posts or hollowed beams plated with thick iron; one
                <lb/>
              end of the axle has a crank, while in the other end are fixed four rods with
                <lb/>
              thick heavy ends, so that they weight the axle, and when turned, make it </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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