Agricola, Georgius, De re metallica, 1912/1950

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              smelters by which of these methods they can obtain the most metal from
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              any one ore. </s>
              <s>Moreover, while sometimes there are many methods of
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              smelting the same ore, by which an equal weight of metal is melted out, yet
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              one is done at a greater cost and labour than the others. </s>
              <s>Ore is either melted
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              with a furnace or without one; if smelted with a furnace the tap-hole is either
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              temporarily closed or always open, and if smelted without a furnace, it is done
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              either in pots or in trenches. </s>
              <s>But in order to make this matter clearer, I will
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              describe each in detail, beginning with the buildings and the furnaces.</s>
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