Agricola, Georgius, De re metallica, 1912/1950

List of thumbnails

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="179"/>
            <figure number="101"/>
            <p type="caption">
              <s>A—POSTS. B—AXLE. C—WOODEN BARS. D—PISTON ROD. E—SHORT PIECE OF WOOD.
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              F—DRAIN. G—THIS MAN IS DIVERTING THE WATER WHICH IS FLOWING OUT OF THE DRAIN,
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              TO PREVENT IT FROM FLOWING INTO THE TRENCHES WHICH ARE BEING DUG.
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              own weight, the piston is pushed in. </s>
              <s>In this way, the water which the pipe
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              contains is drawn through the openings in the disc and emptied by the piston
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              through the spout into the drain. </s>
              <s>There are some who place a hand-bar
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              underneath in place of the short piece of wood. </s>
              <s>This pump, as also the last
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              before described, is less generally used among miners than the others.</s>
            </p>
            <p type="main">
              <s>The fourth kind is not a simple pump but a duplex one. </s>
              <s>It is made as
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              follows. </s>
              <s>A rectangular block of beechwood, five feet long, two and a half
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              feet wide, and one and a half feet thick, is cut in two and hollowed out wide
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              and deep enough so that an iron axle with cranks can revolve in it. </s>
              <s>The axle
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              is placed between the two halves of this box, and the first part of the axle,
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              which is in contact with the wood, is round and the straight end forms a
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              journal. </s>
              <s>Then the axle is bent down the depth of a foot and again bent so
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              as to continue straight, and at this point a round piston-rod hangs from it;
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              next it is bent up as far as it was bent down; then it continues a little way
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              straight again, and then it is bent up a foot and again continues straight,
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              at which point a second round piston-rod is hung from it; afterward it </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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