Agricola, Georgius, De re metallica, 1912/1950

Table of figures

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              <s>A—AREA. B—WOOD. C—ORE. D—CONE-SHAPED PILES. E—CANAL.
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              same ore is soaked with water and smeared over it and beaten on with shovels;
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              some workers, if they cannot obtain such fine sand, cover the pile with char­
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              coal-dust, just as do charcoal-burners. </s>
              <s>But at Goslar, the pile, when it has
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              been built up in the form of a cone, is smeared with
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              atramentum sutorium
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              rubrum
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              5
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              , which is made by the leaching of roasted pyrites soaked with water.
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              <s>In some districts the ore is roasted once, in others twice, in others three times,
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              as its hardness may require. </s>
              <s>At Goslar, when pyrites is roasted for the third
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              time, that which is placed on the top of the pyre exudes a certain greenish,
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              dry, rough, thin substance, as I have elsewhere written
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              6
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              ; this is no more
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              easily burned by the fire than is asbestos. </s>
              <s>Very often also, water is put on
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