Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="323"/>
              particles or concentrates of gold, together with the sand, pass through the
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              holes into the trough which is placed under the frame, and after being
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              collected are washed in the bowl.</s>
            </p>
            <p type="main">
              <s>A box which has a bottom made of a plate full of holes, is placed over
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              the upper end of a sluice, which is fairly long but of moderate width. </s>
              <s>The
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              gold material to be washed is thrown into this box, and a great quantity of
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              water is let in. </s>
              <s>The lumps, if ore is being washed, are mashed with an iron
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              shovel. </s>
              <s>The fine portions fall through the bottom of the box into the sluice,
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              but the coarse pieces remain in the box, and these are removed with a scraper
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              through an opening which is nearly in the middle of one side. </s>
              <s>Since a large
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              amount of water is necessarily let into the box, in order to prevent it from
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              sweeping away any particles of gold which have fallen into the sluice, the
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              sluice is divided off by ten, or if it is as long again, by fifteen riffles. </s>
              <s>These
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              riffles are placed equidistant from one another, and each is higher than the one
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              next toward the lower end of the sluice. </s>
              <s>The little compartments which are
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              thus made are filled with the material and the water which flows through </s>
            </p>
            <figure number="181"/>
            <p type="caption">
              <s>A—SLUICE. B—BOX. C—BOTTOM OF INVERTED BOX. D—OPEN PART OF IT. E—IRON
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              HOE. F—RIFFLES. G—SMALL LAUNDER. H—BOWL WITH WHICH SETTLINGS ARE TAKEN
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              AWAY. I—BLACK BOWL IN WHICH THEY ARE WASHED.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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