Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="333"/>
            <p type="main">
              <s>Some people construct a frame not unlike the one covered with canvas,
                <lb/>
              but shorter. </s>
              <s>In place of the canvas they set pieces of turf in rows. </s>
              <s>They </s>
            </p>
            <figure number="190"/>
            <p type="caption">
              <s>A—HEAD OF FRAME. B—SMALL LAUNDER THROUGH WHICH WATER FLOWS INTO HEAD OF
                <lb/>
              FRAME. C—PIECES OF TURF. D—TROUGH PLACED UNDER FRAME. E—TUB IN WHICH
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              PIECES OF TURF ARE WASHED.
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              wash the sand, which has been thrown into the head of the frame, by letting
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              in water. </s>
              <s>In this way the particles of gold settle in the turf, the mud and
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              sand, together with the water, are carried down into the settling-pit or trough
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              below, which is opened when the work is finished. </s>
              <s>After all the water has
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              passed out of the settling-pit, the sand and mud are carried away and washed
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              over again in the same manner. </s>
              <s>The particles which have clung to the turf
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              are afterward washed down into the settling-pit or trough by a stronger
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              current of the water, which is let into the frame through a small launder.
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              </s>
              <s>The concentrates are finally collected and washed in a bowl. </s>
              <s>Pliny was not
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              ignorant of this method of washing gold. </s>
              <s>“The ulex,” he says, “after being
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              dried, is burnt, and its ashes are washed over a grassy turf, that the gold
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              may settle on it.”</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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