Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="586"/>
              day, as much as in ancient times, there exists the belief in the singular
                <lb/>
              power of the latter to attract to itself the vitreous liquid just as it does iron,
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              and by attracting it to purify and transform green or yellow into white; and
                <lb/>
              afterward fire consumes the
                <emph type="italics"/>
              magnes.
                <emph.end type="italics"/>
              </s>
              <s> When the said juices are not to be had,
                <lb/>
              two parts of the ashes of oak or holmoak, or of hard oak or Turkey oak,
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              or if these be not available, of beech or pine, are mixed with one part
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              of coarse or fine sand, and a small quantity of salt is added, made from salt
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              water or sea-water, and a small particle of
                <emph type="italics"/>
              magnes;
                <emph.end type="italics"/>
              but these make a less
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              white and translucent glass. </s>
              <s>The ashes should be made from old trees, of
                <lb/>
              which the trunk at a height of six feet is hollowed out and fire is put in, and
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              thus the whole tree is consumed and converted into ashes. </s>
              <s>This is done in
                <lb/>
              winter when the snow lies long, or in summer when it does not rain, for the
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              showers at other times of the year, by mixing the ashes with earth, render
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              them impure; for this reason, at such times, these same trees are cut up
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              into many pieces and burned under cover, and are thus converted into ashes.</s>
            </p>
            <p type="main">
              <s>Some glass-makers use three furnaces, others two, others only one.
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              </s>
              <s>Those who use three, melt the material in the first, re-melt it in the second, </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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