Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="587"/>
            <figure number="301"/>
            <p type="caption">
              <s>A—LOWER CHAMBER OF THE FIRST FURNACE. B—UPPER CHAMBER. C—VITREOUS MASS.
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              and in the third they cool the glowing glass vessels and other articles. </s>
              <s>Of
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              these the first furnace must be vaulted and similar to an oven. </s>
              <s>In the upper
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              chamber, which is six feet long, four feet wide, and two feet high, the
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              mixed materials are heated by a fierce fire of dry wood until they melt
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              and are converted into a vitreous mass. </s>
              <s>And if they are not satisfactorily
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              purified from dross, they are taken out and cooled and broken into pieces;
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              and the vitreous pieces are heated in pots in the same furnace.</s>
            </p>
            <p type="main">
              <s>The second furnace is round, ten feet in diameter and eight feet high,
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              and on the outside, so that it may be stronger, it is encompassed by five
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              arches, one and one half feet thick; it consists in like manner of two
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              chambers, of which the lower one is vaulted and is one and one half feet thick.
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              </s>
              <s>In front this chamber has a narrow mouth, through which the wood
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              can be put into the hearth, which is on the ground. </s>
              <s>At the top and in the
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              middle of its vault, there is a large round hole which opens to the upper
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              chamber, so that the flames can penetrate into it. </s>
              <s>Between the arches in
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              the walls of the upper chamber are eight windows, so large that the big­
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              bellied pots may be placed through them on to the floor of the chamber,
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              around the large hole. </s>
              <s>The thickness of these pots is about two digits, their
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              height the same number of feet, and the diameter of the belly one and a half </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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