Agricola, Georgius, De re metallica, 1912/1950

Table of figures

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            <figure number="297"/>
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              <s>A—LONG WALL. B—HIGH WALLS. C—LOW WALLS. D—PLATES. E—UPPER POTS.
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              F—LOWER POTS.
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              The sulphur from such a mixture can best be extracted if the upper pots are
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              placed in a vaulted furnace, like those which I described among other
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              metallurgical subjects in Book VIII., which has no floor, but a grate inside;
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              under this the lower pots are placed in the same manner, but the plates
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              must have larger holes.</s>
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              <s>Others bury a pot in the ground, and place over it another pot with a
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              hole at the bottom, in which pyrites or
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              cadmia,
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              or other sulphurous stones
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              are so enclosed that the sulphur cannot exhale. </s>
              <s>A fierce fire heats the
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              sulphur, and it drips away and flows down into the lower pot, which contains
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              water. (Illustration p. </s>
              <s>582).</s>
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              <s>Bitumen
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              14
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              is made from bituminous waters, from liquid bitumen, and
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              from mixtures of bituminous substances. </s>
              <s>The water, bituminous as well as </s>
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