Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="574"/>
            <figure number="292"/>
            <p type="caption">
              <s>A—TUNNEL. B—BUCKET. C—PIT.
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              In hot regions or in summer, it is poured into out-of-door pits which have
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              been dug to a certain depth, or else it is extracted from shafts by pumps
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              and poured into launders, through which it flows into the pits, where it is
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              condensed by the heat of the sun. </s>
              <s>In cold regions and in winter these vitriol
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              waters are boiled down with equal parts of fresh water in rectangular leaden
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              caldrons; then, when cold, the mixture is poured into vats or into tanks,
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              which Pliny calls wooden fish-tanks. </s>
              <s>In these tanks light cross-beams are
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              fixed to the upper part, so that they may be stationary, and from them hang
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              ropes stretched with little stones; to these the contents of the thickened
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              solutions congeal and adhere in transparent cubes or seeds of vitriol, like
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              bunches of grapes.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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