Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="322"/>
              contains grains of it, are washed in frames or bowls; the sands especially
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              are also washed in troughs. </s>
              <s>More than one method is employed for washing
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              on frames, for these frames either pass or retain the particles or concentrates
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              of gold; they pass them if they have holes, and retain them if they have
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              no holes. </s>
              <s>But either the frame itself has holes, or a box is substituted for
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              it; if the frame itself is perforated it passes the particles or concentrates
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              of gold into a trough; if the box has them, it passes the gold material into
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              the long sluice. </s>
              <s>I will first speak of these two methods of washing. </s>
              <s>The
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              frame is made of two planks joined together, and is twelve feet long and
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              three feet wide, and is full of holes large enough for a pea to pass. </s>
              <s>To prevent
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              the ore or sand with which the gold is mixed from falling out at the sides,
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              small projecting edge-boards are fixed to it. </s>
              <s>This frame is set upon two
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              stools, the first of which is higher than the second, in order that the gravel
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              and small stones can roll down it. </s>
              <s>The washer throws the ore or sand into
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              the head of the frame, which is higher, and opening the small launder, lets
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              the water into it, and then agitates it with a wooden scrubber. </s>
              <s>In this way,
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              the gravel and small stones roll down the frame on to the ground, while the </s>
            </p>
            <figure number="180"/>
            <p type="caption">
              <s>A—HEAD OF FRAME. B—FRAME. C—HOLES. D—EDGE-BOARDS. E—STOOLS
                <lb/>
              F—SCRUBBER. G—TROUGH. H—LAUNDER. I—BOWL.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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