Agricola, Georgius, De re metallica, 1912/1950

Table of figures

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              <s>
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              wooden part nine feet. </s>
              <s>Round about the “dried” cakes are placed large
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              long pieces of charcoal, and in the pipe are placed medium-sized pieces.
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              </s>
              <s>When all these things have been arranged in this manner, the fire must be
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              more violently excited by the blast from the bellows. </s>
              <s>When the copper is
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              melting and the coals blaze, the master pushes an iron bar into the middle
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              of them in order that they may receive the air, and that the flame can force
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              its way out. </s>
              <s>This pointed bar is two and a half feet long, and its wooden
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              handle four feet long. </s>
              <s>When the cakes are partly melted, the master, passing
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              out through the door, inspects the crucible through the bronze pipe, and if he
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              should find that too much of the “slag” is adhering to the mouth of the pipe,
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              and thus impeding the blast of the bellows, he inserts the hooked iron bar
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              into the pipe through the nozzle of the bellows, and, turning this about the
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              mouth of the pipe, he removes the “slags” from it. </s>
              <s>The hook on this bar
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              is two digits high; the iron part of the handle is three feet long; the wooden
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              part is the same number of palms long. </s>
              <s>Now it is time to insert the bar
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              under the iron plate, in order that the “slags” may flow out. </s>
              <s>When the
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              cakes, being all melted, have run into the crucible, he takes out a sample of
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              copper with the third round bar, which is made wholly of iron, and is three feet
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              long, a digit thick, and has a steel point lest its pores should absorb the copper. </s>
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            <figure number="276"/>
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              <s>A—POINTED BAR. B—THIN COPPER LAYER. C—ANVIL. D—HAMMER.</s>
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