Agricola, Georgius, De re metallica, 1912/1950

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                <pb pagenum="421"/>
              He is able to complete this work sometimes in eight hours, sometimes in ten,
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              and again sometimes in twelve. </s>
              <s>In order that the heat of the fire should not
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              burn his face, he covers it entirely with a cap, in which, however, there are
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              holes through which he may see and breathe. </s>
              <s>At the side of the hearth is a
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              bar which he raises as often as is necessary, when the bellows blow too violent
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              a blast, or when he adds more ore and charcoal. </s>
              <s>He also uses the bar
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              to draw off the slags, or to open or close the gates of the sluice, through
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              which the waters flow down on to the wheel which turns the axle that com­
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              presses the bellows. </s>
              <s>In this sensible way, iron is melted out and a mass
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              weighing two or three
                <emph type="italics"/>
              centumpondia
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              may be made, providing the iron ore
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              was rich. </s>
              <s>When this is done the master opens the slag-vent with the tapping­
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              bar, and when all has run out he allows the iron mass to cool. </s>
              <s>Afterward
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              he and his assistant stir the iron with the bar, and then in order to chip off
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              the slags which had until then adhered to it, and to condense and flatten it,
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              they take it down from the furnace to the floor, and boat it with large wooden
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              mallets having slender handles five feet long. </s>
              <s>Thereupon it is immediately </s>
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