Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="561"/>
            <figure number="288"/>
            <p type="caption">
              <s>A—VAT IN WHICH THE SODA IS MIXED. B—CALDRON. C—TUB IN WHICH
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              chrysocolla
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              IS
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              CONDENSED. D—COPPER WIRES. E—MORTAR.</s>
            </p>
            <p type="main">
              <s>Saltpetre
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              9
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              is made from a dry, slightly fatty earth, which, if it be re­
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              tained for a while in the mouth, has an acrid and salty taste. </s>
              <s>This earth,
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              together with a powder, are alternately put into a vat in layers a palm deep.
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              </s>
              <s>The powder consists of two parts of unslaked lime and three parts of ashes of
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              oak, or holmoak, or Italian oak, or Turkey oak, or of some similar kind. </s>
              <s>Each
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              vat is filled with alternate layers of these to within three-quarters of a foot
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              of the top, and then water is poured in until it is full. </s>
              <s>As the water percolates
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              through the material it dissolves the saltpetre; then, the plug being pulled
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              out from the vat, the solution is drained into a tub and ladled out into small </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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