THE POTTER'S ART. 



carrying the produce of the labour of the others to the pounding 

 or crushing-mill represented in fig. 17. The water-wheel acting 

 upon the rectangular arms projecting from the shaft keeps the 

 latter in constant revolution. These arms act upon a series of 

 levers, to the opposite ends of which are attached stone sledges 

 faced with iron. By the action of the wheel upon the short arms 

 of the levers, the long arms carrying the iron-shod stone hammers 

 are alternately raised and let fall. Beneath each of them is placed 

 a trough filled with the rough lumps of petung-tse, which are thus 

 pounded until they are reduced to powder. A man sits near them 

 collecting their contents when pulverised, which he carries in 

 buckets to a large reservoir of water represented in fig. 18, 

 (p. 129), where being thrown, it is strongly agitated until it comes 

 to be well mixed with the water. The mixture thus produced being 

 allowed to remain quiescent for some moments, the grosser and 

 heavier parts of the mineral dust sink to the bottom, and a cream- 

 like liquid remains. This last is then removed in buckets and 

 brought to another reservoir, shown in the drawing, into which it 

 is thrown and agitated as before. 



128 



