Agricola, Georgius, De re metallica, 1912/1950

Page concordance

< >
Scan Original
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
< >
page |< < of 679 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="542"/>
              of the furnace into the forehearth, is likewise dipped out with a ladle into
                <lb/>
              oblong copper moulds; in this way nine or ten cakes are made, which are
                <lb/>
              “dried,” together with bad exhausted liquation cakes, and from these
                <lb/>
              “dried” cakes yellow
                <emph type="sup"/>
              31
                <emph.end type="sup"/>
              copper is made.</s>
            </p>
            <p type="main">
              <s>The
                <emph type="italics"/>
              cadmia,
                <emph.end type="italics"/>
                <emph type="sup"/>
              32
                <emph.end type="sup"/>
              as it is called by us, is made from the “slags” which the
                <lb/>
              master, who makes copper from “dried” cakes, draws off together with other
                <lb/>
              re-melted base “slags”; for, indeed, if the copper cakes made from such
                <lb/>
              “slags” are broken, the fragments are called
                <emph type="italics"/>
              cadmia;
                <emph.end type="italics"/>
              from this and yellow
                <lb/>
              copper is made
                <emph type="italics"/>
              caldarium
                <emph.end type="italics"/>
              copper in two ways. </s>
              <s>For either two parts of
                <emph type="italics"/>
              cadmia
                <emph.end type="italics"/>
                <lb/>
              are mixed with one of yellow copper in the blast furnaces, and melted; or, on
                <lb/>
              the contrary, two parts of yellow copper with one of
                <emph type="italics"/>
              cadmia,
                <emph.end type="italics"/>
              so that the
                <lb/>
                <emph type="italics"/>
              cadmía
                <emph.end type="italics"/>
              and yellow copper may be well mixed; and the copper which flows down
                <lb/>
              from the furnace into the forehearth is poured out with a ladle into oblong
                <lb/>
              copper moulds heated beforehand. </s>
              <s>These moulds are sprinkled over with char­
                <lb/>
              coal dust before the
                <emph type="italics"/>
              caldarium
                <emph.end type="italics"/>
              copper is to be poured into them, and the same
                <lb/>
              dust is sprinkled over the copper when it is poured in, lest the
                <emph type="italics"/>
              cadmia
                <emph.end type="italics"/>
              and
                <lb/>
              yellow copper should freeze before they have become well mixed. </s>
              <s>With a
                <lb/>
              piece of wood the assistant cleanses each cake from the dust, when it is
                <lb/>
              turned out of the mould. </s>
              <s>Then he throws it into the tub containing hot water,
                <lb/>
              for the
                <emph type="italics"/>
              caldarium
                <emph.end type="italics"/>
              copper is finer if quenched in hot water. </s>
              <s>But as I have
                <lb/>
              so often made mention of the oblong copper moulds, I must now speak of
                <lb/>
              them a little; they are a foot and a palm long, the inside is three palms and a
                <lb/>
              digit wide at the top, and they are rounded at the bottom.</s>
            </p>
            <p type="main">
              <s>The concentrates are of two kinds—precious and base.
                <emph type="sup"/>
              33
                <emph.end type="sup"/>
              The first are
                <lb/>
              obtained from the accretions of the blast furnace, when liquation cakes are
                <lb/>
              made from copper and lead, or from precious liquation thorns, or from the
                <lb/>
              better quality “slags,” or from the best grade of concentrates, or from the
                <lb/>
              sweepings and bricks of the furnaces in which exhausted liquation cakes are
                <lb/>
              “dried”; all of these things are crushed and washed, as I explained in Book
                <lb/>
              VIII. </s>
              <s>The base concentrates are made from accretions formed when cakes
                <lb/>
              are cast from base thorns or from the worst quality of slags. </s>
              <s>The smelter
                <lb/>
              who makes liquation cakes from the precious concentrates, adds to them
                <lb/>
              three wheelbarrowsful of litharge and four barrowsful of hearth-lead and
                <lb/>
              one of ash-coloured copper, from all of which nine or ten liquation cakes
                <lb/>
              are melted out, of which five at a time are placed in the furnace in which
                <lb/>
              silver-lead is liquated from copper; a
                <emph type="italics"/>
              centumpondium
                <emph.end type="italics"/>
              of the lead which drips
                <lb/>
              from these cakes contains one
                <emph type="italics"/>
              uncia
                <emph.end type="italics"/>
              of silver. </s>
              <s>The liquation thorns are
                <lb/>
                <lb/>
              </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum