Agricola, Georgius, De re metallica, 1912/1950

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            <p type="main">
              <s>
                <pb pagenum="294"/>
              is turned by water-power, is made in the following way. </s>
              <s>An axle is rounded
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              to compass measure, or is made angular, and its iron pinions turn in iron
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              sockets which are held in beams. </s>
              <s>The axle is turned by a water-wheel, the
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              buckets of which are fixed to the rim and are struck by the force of a stream. </s>
            </p>
            <figure number="161"/>
            <p type="caption">
              <s>A—AXLE. B—WATER-WHEEL. C—TOOTHED DRUM. D—DRUM MADE OF RUNDLES.
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              E—IRON AXLE. F—MILLSTONE. G—HOPPER. H—ROUND WOODEN PLATE.
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              I—TROUGH.
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              Into the axle is mortised a toothed drum, whose teeth are fixed in the side
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              of the rim. </s>
              <s>These teeth turn a second drum of rundles, which are made of
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              very hard material. </s>
              <s>This drum surrounds an iron axle which has a pinion
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              at the bottom and revolves in an iron cup in a timber. </s>
              <s>At the top of the
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              iron axle is an iron tongue, dove-tailed into the millstone, and so when the
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              teeth of the one drum turn the rundles of the other, the millstone is made to
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              turn round. </s>
              <s>An overhanging machine supplies it with ore through a hopper,
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              and the ore, being ground to powder, is discharged from a round wooden plate
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              into a trough and flowing away through it accumulates on the floor;
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              from there the ore is carried away and reserved for washing. </s>
              <s>Since this </s>
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