Agricola, Georgius, De re metallica, 1912/1950

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          <chap>
            <p type="main">
              <s>
                <pb pagenum="276"/>
              Thuringian pyrites, in which there is gold, sulphur, and vitriol, after the last
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              particle of vitriol has been obtained by heating it in water, is thrown into a
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              furnace, in which logs are placed. </s>
              <s>This furnace is very similar to an oven
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              in shape, in order that when the ore is roasted the valuable contents may not
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              fly away with the smoke, but may adhere to the roof of the furnace. </s>
              <s>In this
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              way sulphur very often hangs like icicles from the two openings of the roof
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              through which the smoke escapes.</s>
            </p>
            <figure number="149"/>
            <p type="caption">
              <s>A—BURNING PYRE WHICH IS COMPOSED OF LEAD ORE WITH WOOD PLACED ABOVE IT.
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              B—WORKMAN THROWING ORE INTO ANOTHER AREA. C—OVEN-SHAPED FURNACE.
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              D—OPENINGS THROUGH WHICH THE SMOKE ESCAPES.</s>
            </p>
            <p type="main">
              <s>If pyrites or
                <emph type="italics"/>
              cadmia,
                <emph.end type="italics"/>
              or any other ore containing metal, possesses a good
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              deal of sulphur or bitumen, it should be so roasted that neither is lost. </s>
              <s>For
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              this purpose it is thrown on an iron plate full of holes, and roasted with char­
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              coal placed on top; three walls support this plate, two on the sides and the
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              third at the back. </s>
              <s>Beneath the plate are placed pots containing water, into
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              which the sulphurous or bituminous vapour descends, and in the water the
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              fat accumulates and floats on the top. </s>
              <s>If it is sulphur, it is generally of a
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              yellow colour; if bitumen, it is black like pitch. </s>
              <s>If these were not drawn
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              out they would do much harm to the metal, when the ore is being smelted.
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              </s>
              <s>When they have thus been separated they prove of some service to man,
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              especially the sulphurous kind. </s>
              <s>From the vapour which is carried down, not </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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