Agricola, Georgius, De re metallica, 1912/1950

Table of figures

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            <figure number="244"/>
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              <s>A—AMPULLAE ARRANGED IN THE VESSELS. B—AN AMPULLA STANDING UPRIGHT BETWEEN
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              IRON RODS. C—AMPULLAE PLACED IN THE SAND WHICH IS CONTAINED IN A BOX, THE
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              SPOUTS OF WHICH REACH FROM THE OPERCULA INTO AMPULLAE PLACED UNDER THEM.
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              D—AMPULLAE LIKEWISE PLACED IN SAND WHICH IS CONTAINED IN A BOX, OF WHICH THE
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              SPOUT FROM THE OPERCULA EXTENDS CROSSWISE INTO AMPULLAE PLACED UNDER THEM.
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              E—OTHER AMPULLAE RECEIVING THE DISTILLED
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              aqua
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              AND LIKEWISE ARRANGED IN SAND
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              CONTAINED IN THE LOWER BOXES. F—IRON TRIPOD, IN WHICH THE AMPULLA IS USUALLY
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              PLACED WHEN THERE ARE NOT MANY PARTICLES OF GOLD TO BE PARTED FROM THE SILVER.
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              G—VESSEL.
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              rises into the operculum, there is put into the ampulla one lozenge or two;
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              these are made of soap, cut into small pieces and mixed together with
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              powdered argol, and then heated in a pot over a gentle fire; or else the
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              contents are stirred with a hazel twig split at the bottom, and in both cases
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              the
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              aqua
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              effervesces, and soon after again settles. </s>
              <s>When the powerful vapour
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              appears, the
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              aqua
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              gives off a kind of oil, and the operculum becomes red. </s>
              <s>But,
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              lest the vapours should escape from the ampulla and the operculum in that
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              part where their mouths communicate, they are entirely sealed all round.
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              </s>
              <s>The
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              aqua
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              is boiled continually over a fiercer fire, and enough charcoal must be
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              put into the furnace so that the live coals touch the vessel. </s>
              <s>The ampulla is
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              taken out as soon as all the
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              aqua
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              has been distilled, and the silver, which is dried
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              by the heat of the fire, alone remains in it; the silver is shaken out and put
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              in an earthenware crucible, and heated until it melts. </s>
              <s>The molten glass is
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              extracted with an iron rod curved at the lower end, and the silver is made </s>
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