Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="576"/>
              pegs or wedges driven into them. </s>
              <s>The vitriol adheres to these laths, and
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              within the space of a few days congeals into cubes, which are taken away
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              and put into a chamber having a sloping board floor, so that the moisture
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              which drips from the vitriol may flow into a tub beneath. </s>
              <s>This solution is
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              re-boiled, as is also that solution which was left in the twelve tubs, for, by
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              reason of its having become too thin and liquid, it did not congeal, and was
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              thus not converted into vitriol.</s>
            </p>
            <figure number="294"/>
            <p type="caption">
              <s>A—WOODEN TUB. B—CROSS-BARS. C—LATHS. D—SLOPING FLOOR OF THE CHAMBER.
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              E—TUB PLACED UNDER IT.</s>
            </p>
            <p type="main">
              <s>The fourth method of making vitriol is from vitriolous earth or stones.
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              </s>
              <s>Such ore is at first carried and heaped up, and is then left for five or six months
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              exposed to the rain of spring and autumn, to the heat of summer, and to the
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              rime and frost of winter. </s>
              <s>It must be turned over several times with shovels,
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              so that the part at the bottom may be brought to the top, and it is thus
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              ventilated and cooled; by this means the earth crumbles up and loosens,
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              and the stone changes from hard to soft. </s>
              <s>Then the ore is covered with a roof,
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              or else it is taken away and placed under a roof, and remains in that place
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              six, seven, or eight months. </s>
              <s>Afterward as large a portion as is required is
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              thrown into a vat, which is half-filled with water; this vat is one hundred </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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