Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="340"/>
            <figure number="196"/>
            <p type="caption">
              <s>A—LAUNDER. B—INTERLACING FIR TWIGS. C—LOGS; THREE ON ONE SIDE, FOR THE
                <lb/>
              FOURTH CANNOT BE SEEN BECAUSE THE DITCH IS SO FULL WITH MATERIAL NOW BEING
                <lb/>
              WASHED. D—LOGS AT THE HEAD OF THE DITCH. E—BARROW. F—SEVEN-PRONGED
                <lb/>
              FORK. G—HOE</s>
            </p>
            <p type="main">
              <s>The third method of washing materials of this kind follows. </s>
              <s>Two
                <lb/>
              strakes are made, each of which is twelve feet long and a foot and a
                <lb/>
              half wide and deep. </s>
              <s>A tank is set at their head, into which the water flows
                <lb/>
              through a little launder. </s>
              <s>A boy throws the ore into one strake; if it is of
                <lb/>
              poor quality he puts in a large amount of it, if it is rich he puts in less. </s>
              <s>The
                <lb/>
              water is let in by removing the plug, the ore is stirred with a wooden shovel,
                <lb/>
              and in this way the tin-stone, mixed with the heavier material, settles
                <lb/>
              in the bottom of the strake, and the water carries the light material into the
                <lb/>
              launder, through which it flows on to a canvas strake. </s>
              <s>The very fine tin­
                <lb/>
              stone, carried by the water, settles on to the canvas and is cleansed. </s>
              <s>A low
                <lb/>
              cross-board is placed in the strake near the head, in order that the largest
                <lb/>
              sized tin-stone may settle there. </s>
              <s>As soon as the strake is filled with the
                <lb/>
              material which has been washed, he closes the mouth of the tank and continues
                <lb/>
              washing in the other strake, and then the plug is withdrawn and the
                <lb/>
              water and tin-stone flow down into a tank below. </s>
              <s>Then he pounds the sides </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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