Agricola, Georgius, De re metallica, 1912/1950

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              <s>
                <pb pagenum="307"/>
              also separate the concentrates from the broken rock in them and collect them
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              in tubs. </s>
              <s>The short strake is now rarely employed by miners, owing to the
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              carelessness of the boys, which has been frequently detected; for this
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              reason, the jigging-sieve has taken its place. </s>
              <s>The mud which settles in the
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              launder, if the ore is rich, is taken up and washed in a jigging-sieve or on a
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              canvas strake.</s>
            </p>
            <figure number="169"/>
            <p type="caption">
              <s>A—SHORT STRAKE. B—SMALL LAUNDER. C—TRANSVERSE LAUNDER. D—WOODEN
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              SCRUBBER.</s>
            </p>
            <p type="main">
              <s>A canvas strake is made in the following way. </s>
              <s>Two beams, eighteen feet
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              long and half a foot broad and three palms thick, are placed on a slope; one
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              half of each of these beams is partially cut away lengthwise, to allow the ends
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              of planks to be fastened in them, for the bottom is covered by planks three
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              feet long, set crosswise and laid close together. </s>
              <s>One half of each supporting
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              beam is left intact and rises a palm above the planks, in order that the water
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              that is running down may not escape at the sides, but shall flow straight
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              down. </s>
              <s>The head of the strake is higher than the rest of the body, and slopes
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              so as to enable the water to flow away. </s>
              <s>The whole strake is covered by six
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              stretched pieces of canvas, smoothed with a stick. </s>
              <s>The first of them occupies
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              the lowest division, and the second is so laid as to slightly overlap it; on </s>
            </p>
          </chap>
        </body>
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