Agricola, Georgius, De re metallica, 1912/1950

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      <text>
        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="278"/>
              into the water, but into the ground, there is created a sulphurous or a
                <lb/>
              bituminous substance resembling
                <emph type="italics"/>
              pompholyx
                <emph.end type="italics"/>
                <emph type="sup"/>
              7
                <emph.end type="sup"/>
              , and so light that it can be
                <lb/>
              blown away with a breath. </s>
              <s>Some employ a vaulted furnace, open at the
                <lb/>
              front and divided into two chambers. </s>
              <s>A wall built in the middle of the
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              furnace divides the lower chamber into two equal parts, in which are set pots
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              containing water, as above described. </s>
              <s>The upper chamber is again divided
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              into three parts, the middle one of which is always open, for in it the wood
                <lb/>
              is placed, and it is not broader than the middle wall, of which it forms the
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              topmost portion. </s>
              <s>The other two compartments have iron doors which are
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              closed, and which, together with the roof, keep in the heat when the wood
                <lb/>
              is lighted. </s>
              <s>In these upper compartments are iron bars which take the place
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              of a floor, and on these are arranged pots without bottoms, having in
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              place of a bottom, a grating made of iron wire, fixed to each, through
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              the openings of which the sulphurous or bituminous vapours roasted from
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              the ore run into the lower pots. </s>
              <s>Each of the upper pots holds a hundred </s>
            </p>
            <figure number="151"/>
            <p type="caption">
              <s>A—HEAP OF CUPRIFEROUS STONES. B—KINDLED HEAP. C—STONES BEING TAKEN TO
                <lb/>
              THE BEDS OF FAGGOTS.</s>
            </p>
          </chap>
        </body>
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