Agricola, Georgius, De re metallica, 1912/1950

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              <s>
                <pb pagenum="427"/>
              with moss, are placed upside down in the openings of the lower pots, where they
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              are joined with lute, lest the quicksilver which takes refuge in them should
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              be exhaled. </s>
              <s>There are some who, after the pots have been buried, do not fear
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              to leave them uncemented, and who boast that they are able to produce no
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              less weight of quicksilver than those who do cement them, but nevertheless
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              cementing with lute is the greatest protection against exhalation. </s>
              <s>In this
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              manner seven hundred pairs of pots are set together in the ground or on a
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              hearth. </s>
              <s>They must be surrounded on all sides with a mixture consisting of
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              crushed earth and charcoal, in such a way that the upper pots protrude to a
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              height of a palm above it. </s>
              <s>On both sides of the hearth rocks are first laid,
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              and upon them poles, across which the workmen place other poles transversely;
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              these poles do not touch the pots, nevertheless the fire heats the quick­
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              silver, which fleeing from the heat is forced to run down through the moss
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              into the lower pots. </s>
              <s>If the ore is being reduced in the upper pots, it flees
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              from them, wherever there is an exit, into the lower pots, but if the ore on
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              the contrary is put in the lower pots the quicksilver rises into the upper pot
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              or into the operculum, which, together with the gourd-shaped vessels, are
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              cemented to the upper pots.</s>
            </p>
            <figure number="233"/>
            <p type="caption">
              <s>A—HEARTH. B—POLES. C—HEARTH WITHOUT FIRE IN WHICH THE POTS ARE PLACED.
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              D—ROCKS. E—ROWS OF POTS. F—UPPER POTS. G—LOWER POTS.</s>
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