3o8 



BOOK VIII. 



A — Beams. B — Canvas. C — Head of strake. D — Small launder. E— Settling 

 PIT OR tank. F — Wooden scrubber. G — Tubs. 



the second division, the third is similarly laid, and so on, one on the other. 

 If they are laid in the opposite way, the water flowing down carries the 

 concentrates or particles of tin-stone under the canvas, and a useless task 

 is attempted. Boys or men throw the concentrates or tin-stuff mixed with 

 mud into the head of the strake, after the canvas has been thus stretched, 

 and having opened the small launder they let the water flow in ; then 

 they stir the concentrates or tin-stone with a wooden scrubber till the water 

 carries them all on to the canvas ; next they gently sweep the linen with 

 the wooden scrubber untU the mud flows into the settling-pit or into the 

 transverse launder. As soon as there is little or no mud on the canvas, but 

 only concentrates or tin-stone, they carry the canvas away and wash it in a 

 tub placed close by. The tin-stone settles in the tub, and the men return 

 immediately to the same task. Finally, they pour the water out of the tub, 

 and collect the concentrates or tin-stone. However, if either concentrates 

 or tin-stone have washed down from the canvas and settled in the setthng- 

 pit or in the transverse launder, they wash the mud again. 



Some neither remove the canvas nor wash it in the tubs, but place over 



