Agricola, Georgius, De re metallica, 1912/1950

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              not easily separated, is added sulphur and sand made from stones which
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              easily melt.</s>
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              <s>
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              Sal artíficíosus
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                <emph type="sup"/>
              19
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              suitable for use in assaying ore is made in many ways.
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              </s>
              <s>By the first method, equal portions of argol, lees of vinegar, and urine,
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              are all boiled down together till turned into salt. </s>
              <s>The second method is from
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              equal portions of the ashes which wool-dyers use, of lime. </s>
              <s>of argol purified,
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              and of melted salt; one
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              libra
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              of each of these ingredients is thrown into
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              twenty
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              líbrae
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              of urine; then all are boiled down to one-third and strained,
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              and afterward there is added to what remains one
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              líbra
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              and four
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              uncíae
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                <lb/>
              of unmelted salt, eight pounds of lye being at the same time poured into
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              the pots, with litharge smeared around on the inside, and the whole is boiled
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              till the salt becomes thoroughly dry. </s>
              <s>The third method follows. </s>
              <s>Unmelted
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              salt, and iron which is eaten with rust, are put into a vessel, and after
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              urine has been poured in, it is covered with a lid and put in a warm place
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              for thirty days; then the iron is washed in the urine and taken out, and
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              the residue is boiled until it is turned into salt. </s>
              <s>In the fourth method by
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              which
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              sal artíficíosus
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              is prepared, the lye made from equal portions of
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              lime and the ashes which wool-dyers use, together with equal portions of
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              salt, soap, white argol, and saltpetre, are boiled until in the end the mix­
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              ture evaporates and becomes salt. </s>
              <s>This salt is mixed with the concentrates
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              from washing, to melt them.</s>
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              <s>Saltpetre is prepared in the following manner, in order that it may be
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              suitable for use in assaying ore. </s>
              <s>It is placed in a pot which is smeared on
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              the inside with litharge, and lye made of quicklime is repeatedly poured over
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              it, and it is heated until the fire consumes it. </s>
              <s>Wherefore the saltpetre
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              does not kindle with the fire, since it has absorbed the lime which preserves
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              it, and thus it is prepared
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              20
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              .</s>
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              <s>The following compositions
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              21
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              are recommended to smelt all ores which
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              the heat of fire breaks up or melts only with difficulty. </s>
              <s>Of these, one is made
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              from stones of the third order, which easily melt when thrown into hot
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              furnaces. </s>
              <s>They are crushed into pure white powder, and with half an
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              uncia
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                <lb/>
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              </s>
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