Agricola, Georgius, De re metallica, 1912/1950

Table of figures

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              <s>Other methods for reducing quicksilver are given below. </s>
              <s>Big-bellied
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              pots, having been placed in the upper rectangular open part of a furnace,
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              are filled with the crushed ore. </s>
              <s>Each of these pots is covered with a lid
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              with a long nozzle—commonly called a
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              campana
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              —in the shape of a bell, and
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              they are cemented. </s>
              <s>Each of the small earthenware vessels shaped like a
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              gourd receives two of these nozzles, and these are likewise cemented. </s>
              <s>Dried </s>
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              <s>A—POTS. B—OPERCULA. C—NOZZLES. D—GOURD-SHAPED EARTHENWARE VESSELS.
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              wood having been placed in the lower part of the furnace and kindled, the
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              ore is heated until all the quicksilver has risen into the operculum which is
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              over the pot; it then flows from the nozzle and is caught in the earthenware
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              gourd-shaped vessel.</s>
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