Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="321"/>
              concentrates are washed separately in different bowls from those which have
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              settled on the canvas. </s>
              <s>This bowl is smooth and two digits wide and deep,
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              being in shape very similar to a small boat; it is broad in the fore part,
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              narrow in the back, and in the middle of it there is a cross groove, in which
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              the particles of pure gold or silver settle, while the grains of sand, since they
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              are lighter, flow out of it.</s>
            </p>
            <p type="main">
              <s>In some parts of Moravia, gold ore, which consists of quartz mixed with
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              gold, is placed under the stamps and crushed wet. </s>
              <s>When crushed fine it
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              flows out through a launder into a trough, is there stirred by a wooden
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              scrubber, and the minute particles of gold which settle in the upper end of
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              the trough are washed in a black bowl.</s>
            </p>
            <figure number="179"/>
            <p type="caption">
              <s>A—STAMPS. B—MORTAR. C—PLATES FULL OF HOLES. D—TRANSVERSE LAUNDER.
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              E—PLANKS FULL OF CUP-LIKE DEPRESSIONS. F—SPOUT. G—BOWL INTO WHICH THE
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              CONCENTRATES FALL. H—CANVAS STRAKE. I—BOWLS SHAPED LIKE A SMALL BOAT.
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              K—SETTLING-PIT UNDER THE CANVAS STRAKE.</s>
            </p>
            <p type="main">
              <s>So far I have spoken of machines which crush wet ore with iron-shod
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              stamps. </s>
              <s>I will now explain the methods of washing which are in a measure
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              peculiar to the ore of certain metals, beginning with gold. </s>
              <s>The ore which
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              contains particles of this metal, and the sand of streams and rivers which </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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