Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="324"/>
              the box; as soon as these compartments are full and the water has begun
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              to flow over clear, the little launder through which this water enters into the
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              box is closed, and the water is turned in another direction. </s>
              <s>Then the
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              lowest riffle is removed from the sluice, and the sediment which has
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              accumulated flows out with the water and is caught in a bowl. </s>
              <s>The
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              riffles are removed one by one and the sediment from each is taken into a
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              separate bowl, and each is separately washed and cleansed in a bowl. </s>
              <s>The
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              larger particles of gold concentrates settle in the higher compartments, the
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              smaller size, in the lower compartments. </s>
              <s>This bowl is shallow and smooth,
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              and smeared with oil or some other slippery substance, so that the tiny particles
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              of gold may not cling to it, and it is painted black, that the gold may be more
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              easily discernible; on the exterior, on both sides and in the middle, it is
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              slightly hollowed out in order that it may be grasped and held firmly in the
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              hands when shaken. </s>
              <s>By this method the particles or concentrates of gold
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              settle in the back part of the bowl; for if the back part of the bowl is
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              tapped or shaken with one hand, as is usual, the contents move toward the
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              fore part. </s>
              <s>In this way the Moravians, especially, wash gold ore.</s>
            </p>
            <p type="main">
              <s>The gold particles are also caught on frames which are either bare or
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              covered. </s>
              <s>If bare, the particles are caught in pockets; if covered, they </s>
            </p>
            <figure number="182"/>
            <p type="caption">
              <s>A—PLANK. B—SIDE-BOARDS. C—IRON WIRE. D—HANDLES.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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