Agricola, Georgius, De re metallica, 1912/1950

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      <text>
        <body>
          <chap>
            <pb pagenum="328"/>
            <figure number="185"/>
            <p type="caption">
              <s>A—CROSS GROOVES. B—TUB SET UNDER THE SLUICE. C—ANOTHER TUB.
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              is to be washed, is thrown into the head and stirred with a wooden scrubber;
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              in this way the water carries the light particles of gold on to the canvas,
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              and the heavy ones sink in the pockets, and when these hollows are full, the
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              head is removed and turned over a tub, and the concentrates are collected
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              and washed in a bowl. </s>
              <s>Some people make use of a sluice which has square
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              pockets with short vertical recesses which hold the particles of gold. </s>
              <s>Other
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              workers use a sluice made of planks, which are rough by reason of the very
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              small shavings which still cling to them; these sluices are used instead of
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              those with coverings, of which this sluice is bare, and when the sand is washed,
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              the particles of gold cling no less to these shavings than to canvas, or skins, or
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              cloths, or turf. </s>
              <s>The washer sweeps the sluice upward with a broom, and
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              when he has washed as much of the sand as he wishes, he lets a more abundant
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              supply of water into the sluice again to wash out the concentrates, which he
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              collects in a tub set below the sluice, and then washes again in a bowl. </s>
              <s>Just
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              as Thuringians cover the sluice with canvas, so some people cover it with
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              the skins of oxen or horses. </s>
              <s>They push the auriferous sand upward with a
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              wooden scrubber, and by this system the light material flows away with the
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              water, while the particles of gold settle among the hairs; the skins are
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              afterward washed in a tub; and the concentrates are colleced in a bowl.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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