Agricola, Georgius, De re metallica, 1912/1950

Table of figures

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            <figure number="183"/>
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              <s>A—HEAD OF THE SLUICE. B—RIFFLES. C—WOODEN SCRUBBER. D—POINTED STICK.
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              E—DISH. F—ITS CUP-LIKE DEPRESSION. G—GROOVED DISH.</s>
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              <s>The cup-like pockets and grooves are cut or burned at the same time into
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              the bottom of the sluice; the bottom is composed of three planks ten feet
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              long, and is about four feet wide; but the lower end, through which the water
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              is discharged, is narrower. </s>
              <s>This sluice, which likewise has side-boards fixed
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              to its edges, is full of rounded pockets and of grooves which lead to them,
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              there being two grooves to one pocket, in order that the water mixed with
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              sand may flow into each pocket through the upper groove, and that after the
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              sand has partly settled, the water may again flow out through the lower
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              groove. </s>
              <s>The sluice is set in the river or stream or on the bank, and placed
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              on two stools, of which the first is higher than the second in order that the
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              gravel and small stones may roll down the sluice. </s>
              <s>The washer throws sand
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              into the head with a shovel, and opening the launder, lets in the water, which
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              carries the particles of metal with a little sand down into the pockets, while
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              the gravel and small stones with the rest of the sand falls into a tub placed
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              below the sluice. </s>
              <s>As soon as the pockets are filled, he brushes out the
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              concentrates and washes them in a bowl. </s>
              <s>He washes again and again
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              through this sluice.</s>
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