Agricola, Georgius, De re metallica, 1912/1950

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          <chap>
            <p type="main">
              <s>
                <pb pagenum="392"/>
              this is laid as much pure lead ore as the heap can bear; then the charcoal is
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              kindled, and when the wind blows, it fans the fire so that the ore is smelted.
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              </s>
              <s>In this wise the lead, trickling down from the heap, flows on to the level and
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              forms broad thin slabs. </s>
              <s>A few hundred pounds of lead ore are kept at hand,
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              which, if things go well, are scattered over the heap. </s>
              <s>These broad slabs are
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              impure and are laid upon dry wood which in turn is placed on green wood
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              laid over a large crucible, and the former having been kindled, the lead is
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              re-melted.</s>
            </p>
            <p type="main">
              <s>The Poles use a hearth of bricks four feet high, sloping on both sides and
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              plastered with lute. </s>
              <s>On the upper level part of the hearth large pieces of
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              wood are piled, and on these is placed small wood with lute put in between;
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              over the top are laid wood shavings, and upon these again pure lead ore
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              covered with large pieces of wood. </s>
              <s>When these are kindled, the ore melts and </s>
            </p>
          </chap>
        </body>
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