Agricola, Georgius, De re metallica, 1912/1950

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      <text>
        <body>
          <chap>
            <pb pagenum="398"/>
            <p type="main">
              <s>Or to a
                <emph type="italics"/>
              líbra
                <emph.end type="italics"/>
              of the powder prepared from such metalliferous
                <lb/>
              concentrates, is added a
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              each of salt, of saltpetre, of argol, and of
                <lb/>
              glass-galls, and it is heated until it melts. </s>
              <s>When cooled and crushed, it is washed,
                <lb/>
              then to it is added a
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              of silver, a third of copper filings, a sixth of litharge,
                <lb/>
              and it is likewise heated again until it melts. </s>
              <s>After the button has been
                <lb/>
              purged of slag, it is put into the cupel, and the gold and silver are separated
                <lb/>
              from the lead; the gold is parted from the silver with
                <emph type="italics"/>
              aqua valens.
                <emph.end type="italics"/>
              </s>
              <s> Or else
                <lb/>
              a
                <emph type="italics"/>
              líbra
                <emph.end type="italics"/>
              of the powder prepared from such metalliferous concentrates,
                <lb/>
              a quarter of a
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              of copper filings, and two
                <emph type="italics"/>
              librae
                <emph.end type="italics"/>
              of that second powder
                <emph type="sup"/>
              32
                <emph.end type="sup"/>
                <lb/>
              which fuses ores, are heated until they melt. </s>
              <s>The mixture when cooled is again
                <lb/>
              reduced to powder, roasted and washed, and in this manner a blue powder is
                <lb/>
              obtained. </s>
              <s>Of this, and silver, and that second powder which fuses ores, a
                <lb/>
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              each are taken, together with three
                <emph type="italics"/>
              librae
                <emph.end type="italics"/>
              of lead, and a quarter of a
                <lb/>
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              of copper, and they are heated together until they melt; then the
                <lb/>
              button is treated as before. </s>
              <s>Or else a
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              of the powder prepared from
                <lb/>
              such metalliferous concentrates, half a
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              of saltpetre, and a quarter of a
                <lb/>
                <emph type="italics"/>
              líbra
                <emph.end type="italics"/>
              of salt are heated until they melt. </s>
              <s>The alloy when cooled is again
                <lb/>
              crushed to powder, one
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              of which is absorbed by four pounds of molten
                <lb/>
              silver. </s>
              <s>Or else a
                <emph type="italics"/>
              líbra
                <emph.end type="italics"/>
              of the powder made from that kind of concentrates,
                <lb/>
              together with a
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              of sulphur, a
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              and a half of salt, a third of a
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              of
                <lb/>
              salt made from argol, and a third of a
                <emph type="italics"/>
              líbra
                <emph.end type="italics"/>
              of copper resolved into powder
                <lb/>
              with sulphur, are heated until they melt. </s>
              <s>Afterward the lead is re-melted,
                <lb/>
              and the gold is separated from the other metals. </s>
              <s>Or else a
                <emph type="italics"/>
              líbra
                <emph.end type="italics"/>
              of the
                <lb/>
              powder of this kind of concentrates, together with two
                <emph type="italics"/>
              líbrae
                <emph.end type="italics"/>
              of salt, half a
                <lb/>
                <emph type="italics"/>
              líbra
                <emph.end type="italics"/>
              of sulphur, and one
                <emph type="italics"/>
              libra
                <emph.end type="italics"/>
              of litharge, are heated, and from these the
                <lb/>
              gold is melted out. </s>
              <s>By these and similar methods concentrates containing
                <lb/>
              gold, if there be a small quantity of them or if they are very rich, can be
                <lb/>
              smelted outside the blast furnace.</s>
            </p>
            <p type="main">
              <s>If there be much of them and they are poor, then they are smelted in the
                <lb/>
              blast furnace, especially the ore which is not crushed to powder, and particularly
                <lb/>
              when the gold mines yield an abundance of it
                <emph type="sup"/>
              33
                <emph.end type="sup"/>
              . </s>
              <s>The gold concentrates mixed
                <lb/>
              with litharge and hearth-lead, to which are added iron-scales, are smelted in the
                <lb/>
              blast furnace whose tap-hole is intermittently closed, or else in the first or the
                <lb/>
              second furnaces in which the tap-hole is always open. </s>
              <s>In this manner an
                <lb/>
              </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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