BOOK VIII. 



315 



This method of washing has lately undergone a considerable change ; for 

 the launtUT which carries the water, mixed with the crushed tin-stone and 

 fine sand which flow from the openings of the screen, does not reach to a 

 transverse trough which is inside the same room, but runs straight through 

 a partition into a small settling-pit. A boy draws a three-toothed rake 

 through the material which has settled in the portion of the launder outside 

 the room, by which means the larger sized particles of tin-stone settle at the 

 bottom, and these the washer takes out with the wooden shovel and carries 

 into the room ; this material is thrown into an ordinary strake and swept 

 with a wooden scrubber and washed. As for those tin-stone particles which 

 the water carries off from the strake, after they have been brought back on to 

 the strake, he washes them again until they are clean. 



The remaining tin-stone, mixed with sand, flows into the small settling-pit 

 which is within the building, and this discharges into two large buddies. The 

 tin-stone of moderate size, mixed with those of fairly large size, settle in the 

 upper part, and the small size in the lower part ; but both are impure, and 

 for this reason they are taken out separately and th? former is washed twice, 



A — First launder. B — Three-toothed rake. C — Small settling pit. D — Large 



BUDDLE. E — BUDDLE RESEMBLING THE SIMPLE BUBBLE. F — SmALL ROLLER- G — 



Boards. H — Their holes. I — Shovel. K — Building. L — Stove. (This picture 



DOES NOT entirely AGREE WITH THE TEXT). 



