Agricola, Georgius, De re metallica, 1912/1950

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              the outer end, which alternately raise the stamp, in order that, by its dropping
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              into the mortar, it may with its iron head pound and crush the rock which
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              has been thrown under it. </s>
              <s>To the cam-shaft is fixed a water-wheel whose
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              buckets are turned by water-power. </s>
              <s>Instead of doors, the mouth of the
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              mortar has a board, which is fitted into notches cut out of the front of the block.
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              <s>This board can be raised, in order that when the mouth is open, the workmen </s>
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