Agricola, Georgius, De re metallica, 1912/1950

Table of figures

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="349"/>
              teeth, and now again levelled down with a hoe, both of which are made of iron.
                <lb/>
              </s>
              <s>The very fine tin-stone requires to be burned less than that of moderate size,
                <lb/>
              and this again less than that of the largest size. </s>
              <s>While the tin-stone is being
                <lb/>
              thus burned, it frequently happens that some of the material runs together. </s>
            </p>
            <figure number="204"/>
            <p type="caption">
              <s>A—FURNACE. B—ITS MOUTH. C—POKER. D—RAKE WITH TWO TEETH. E—HOE.
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              The burned tin-stone should then be washed again on the strake, for in this
                <lb/>
              way the material which has been run together is carried away by the water
                <lb/>
              into the cross-trough, where it is gathered up and worked over, and again
                <lb/>
              washed on the strake. </s>
              <s>By this method the metal is separated from that
                <lb/>
              which is devoid of metal.</s>
            </p>
            <p type="main">
              <s>Cakes from pyrites, or
                <emph type="italics"/>
              cadmía,
                <emph.end type="italics"/>
              or cupriferous stones, are roasted in quad­
                <lb/>
              rangular pits, of which the front and top are open, and these pits are generally
                <lb/>
              twelve feet long, eight feet wide, and three feet deep. </s>
              <s>The cakes of melted
                <lb/>
              pyrites are usually roasted twice over, and those of
                <emph type="italics"/>
              cadmía
                <emph.end type="italics"/>
              once. </s>
              <s>These latter
                <lb/>
              are first rolled in mud moistened with vinegar, to prevent the fire from con­
                <lb/>
              suming too much of the copper with the bitumen, or sulphur, or orpiment, or
                <lb/>
              realgar. </s>
              <s>The cakes of pyrites are first roasted in a slow fire and afterward in
                <lb/>
              a fierce one, and in both cases, during the whole following night, water is let in, </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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