Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="374"/>
              bellows in rotation. </s>
              <s>Finally we must not omit to state that this is only one
                <lb/>
              of many such axles having cams and a water-wheel.</s>
            </p>
            <p type="main">
              <s>I have arrived thus far with many words, and yet it is not unseasonable
                <lb/>
              that I have in this place pursued the subject minutely, since the smelting of all
                <lb/>
              the metals, to which I am about to proceed, could not be undertaken without
                <lb/>
              it.</s>
            </p>
            <p type="main">
              <s>The ores of gold, silver, copper, and lead, are smelted in a furnace by
                <lb/>
              four different methods. </s>
              <s>The first method is for the rich ores of gold or silver,
                <lb/>
              the second for the mediocre ores, the third for the poor ores, and the fourth
                <lb/>
              method is for those ores which contain copper or lead, whether they contain
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              precious metals or are wanting in them. </s>
              <s>The smelting of the first ores is
                <lb/>
              performed in the furnace of which the tap-hole is intermittently closed; the
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              other three ores are melted in furnaces of which the tap-holes are always
                <lb/>
              open.</s>
            </p>
            <p type="main">
              <s>First, I will speak of the manner in which the furnaces are prepared for
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              the smelting of the ores, and of the first method of smelting. </s>
              <s>The powder
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              from which the hearth and forehearth should be made is composed of char­
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              coal and earth (clay?). The charcoal is crushed by the stamps in a mortar­
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              box, the front of which is closed by a board at the top, while the charcoal, </s>
            </p>
            <figure number="217"/>
            <p type="caption">
              <s>A—TUB. B—SIEVE. C—RODS. D—BENCH-FRAME.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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