Agricola, Georgius, De re metallica, 1912/1950

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              to the ore which has been roasted, while it is still hot, in order to make
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              it softer and more easily broken; for after fire has dried up the moisture
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              in the ore, it breaks up more easily while it is still hot, of which fact burnt
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              limestone affords the best example.</s>
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              <s>By digging out the earth they make the areas much larger, and square;
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              walls should be built along the sides and back to hold the heat of the
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              fire more effectively, and the front should be left open. </s>
              <s>In these compart­
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              ments tin ore is roasted in the following manner. </s>
              <s>First of all wood about
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              twelve feet long should be laid in the area in four layers, alternately straight
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              and transverse. </s>
              <s>Then the larger pieces of ore should be laid upon them, and
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              on these again the smaller ones, which should also be placed around the sides;
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              the fine sand of the same ore should also be spread over the pile and pounded
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              with shovels, to prevent the pile from falling before it has been roasted; the
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              wood should then be fired.</s>
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            <figure number="148"/>
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              <s>A—LIGHTED PYRE. B—PYRE WHICH IS BEING CONSTRUCTED. C—ORE. D—WOOD.
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              E—PILE OF THE SAME WOOD.</s>
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              <s>Lead ore, if roasting is necessary, should be piled in an area just like the
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              last, but sloping, and the wood should be placed over it. </s>
              <s>A tree trunk should
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              be laid right across the front of the ore to prevent it from falling out. </s>
              <s>The
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              ore, being roasted in this way, becomes partly melted and resembles slag. </s>
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