Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="342"/>
            <figure number="198"/>
            <p type="caption">
              <s>A—SIEVE. B—TUB. C—WATER FLOWING OUT OF THE BOTTOM OF IT. D—STRAKE.
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              E—THREE-TOOTHED RAKE. F—WOODEN SCRUBBER.
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              earth or sand is found on the slopes of mountains or hills, or in the level fields
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              which are either devoid of streams or into which a stream cannot be diverted,
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              miners have lately begun to employ the following method of washing, even
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              in the winter months. </s>
              <s>An open box is constructed of planks, about six
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              feet long, three feet wide, and two feet and one palm deep. </s>
              <s>At the upper
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              end on the inside, an iron plate three feet long and wide is fixed, at a depth
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              of one foot and a half from the top; this plate is very full of holes, through
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              which tin-stone about the size of a pea can fall. </s>
              <s>A trough hewn from a tree
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              is placed under the box, and this trough is about twenty-four feet long and
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              three-quarters of a foot wide and deep; very often three cross-boards are
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              placed in it, dividing it off into compartments, each one of which is lower
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              than the next. </s>
              <s>The turbid waters discharge into a settling-pit.</s>
            </p>
            <p type="main">
              <s>The metalliferous material is sometimes found not very deep beneath
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              the surface of the earth, but sometimes so deep that it is necessary to drive
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              tunnels and sink shafts. </s>
              <s>It is transported to the washing-box in wheel­
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              barrows, and when the washers are about to begin they lay a small launder, </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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