BOOK VIII . 307 also separate the concentrates from the broken rock in them and collect them in tubs . The short strake is now rarely employed by miners , owing to the carelessness of the boys , which has been frequently detected ; for this reason , the jigging - sieve has taken its place . The mud… … A — Short strake . B — Small launder . C — Transverse launder . D — Wooden SCRUBBER . A canvas strake is made in the following way . Two beams , eighteen feet long and half a foot broad and three palms thick , are placed on a slope ; one half of each of these beams is partially cut away lengthwise…
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