Agricola, Georgius, De re metallica, 1912/1950

Table of figures

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[Figure 311]
[Figure 312]
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              Then the
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              stannum
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              runs out of the furnace into the forehearth; this is an alloy
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              of lead and silver. </s>
              <s>From the silver-lead alloy they first skim off the slags,
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              not rarely white, as some pyrites
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              49
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              are, and afterward they skim off the
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              cakes of pyrites, if there are any. </s>
              <s>In these cakes there is usually some copper;
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              but since there is usually but a very small quantity, and as the forest </s>
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