BOOK VIII.

3i5

This method of washing has lately undergone a considerable change ; forthe launder which carries the water, mixed with the crushed tin-stone andfine sand which flow from the openings of the screen, does not reach to atransverse trough which is inside the same room, but runs straight througha partition into a small settling-pit. A boy draws a three-toothed rakethrough the material which has settled in the portion of the launder outsidethe room, by which means the larger sized particles of tin-stone settle at thebottom, and these the washer takes out with the wooden shovel and carriesinto the room ; this material is thrown into an ordinary strake and sweptwith a wooden scrubber and washed. As for those tin-stone particles whichthe water carries off from the strake, after they have been brought back on tothe strake, he washes them again until they are clean.

The remaining tin-stone, mixed with sand, flows into the small settling-pitwhich is within the building, and this discharges into two large buddies. Thetin-stone of moderate size, mixed with those of fairly large size, settle in theupper part, and the small size in the lower part; but both are impure, andfor this reason they are taken out separately and the former is washed twice,

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A —InRST LAUNDER. B —THREE-TOOTHED RAKE. C —SMALL SETTLING PIT. D —LARGEbuddle. E —Buddle resembling the simple buddle. F —Small roller G—Boards. H —Their .holes. I —Shovel. K —Building. L —Stove. (This picture

DOES NOT ENTIRELY AGREE WITH THE TEXT).