Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="543"/>
            <figure number="278"/>
            <p type="caption">
              <s>A—FURNACE. B—FOREHEARTH. C—OBLONG MOULDS.
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              placed apart by themselves, of which one basketful is mixed with the precious
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              thorns to be re-melted. </s>
              <s>The exhausted liquation cakes are “dried” at the
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              same time as other good exhausted liquation cakes.</s>
            </p>
            <p type="main">
              <s>The thorns which are drawn off from the lead, when it is separated from
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              silver in the cupellation furnace
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              34
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              , and the hearth-lead which remains in the
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              crucible in the middle part of the furnaces, together with the hearth material
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              which has become defective and has absorbed silver-lead, are all melted
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              together with a little slag in the blast furnaces. </s>
              <s>The lead, or rather the
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              silver-lead, which flows from the furnace into the fore-hearth, is poured out
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              into copper moulds such as are used by the refiners; a
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              centumpondium
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              of
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              such lead contains four
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              uncíae
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              of silver, or, if the hearth was defective, it
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              contains more. </s>
              <s>A small portion of this material is added to the copper and
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              lead when liquation cakes are made from them, if more were to be added
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              the alloy would be much richer than it should be, for which reason the wise </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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