Agricola, Georgius, De re metallica, 1912/1950

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        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="358"/>
              this vent slopes upward, and sooner or later penetrates through to the other
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              side of the wall, against which the furnace is built. </s>
              <s>At the end of this vent
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              there is an opening where the steam, into which the water has been converted,
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              is exhausted through a copper or iron tube or pipe. </s>
              <s>This method of making
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              the tank and the vent is much the best. </s>
              <s>Another kind has a similar vent
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              but a different tank, for it does not lie transversely under the forehearth,
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              but lengthwise; it is two feet and a palm long, and a foot and three palms
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              wide, and a foot and a palm deep. </s>
              <s>This method of making tanks is not
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              condemned by us, as is the construction of those tanks without a vent;
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              the latter, which have no opening into the air through which the vapour may
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              discharge freely, are indeed to be condemned.</s>
            </p>
            <figure number="209"/>
            <p type="caption">
              <s>A—FURNACES. B—FOREHEARTH. C—DOOR. D—WATER TANK. E—STONE WHICH
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              COVERS IT. F—MATERIAL OF THE VENT WALLS. G—STONE WHICH COVERS IT. H—PIPE
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              EXHALING THE VAPOUR.</s>
            </p>
            <p type="main">
              <s>Fifteen feet behind the second wall is constructed the first wall, thirteen
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              feet high. </s>
              <s>In both of these are fixed roof beams
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              4
                <emph.end type="sup"/>
              , which are a foot wide and </s>
            </p>
          </chap>
        </body>
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