A 'TOUR ROUND NORTH WALES. 285 



at three pounds per ton, might produce 

 very good profit to the undertakers, if any 

 mould fettle fuch a manufacture there** 



Befides this, the proprietors have another 

 artificial method of producing copper, this 

 is by placing great quantities of iron of any 

 kind whatever, either new or old, though 

 for the fake of convenience they generally 

 procure new plates, caft for the purpofe, in 

 rectangular pits, fimilar to thofe ufed in 

 the above procefs j they are about thirty 

 feet long, twelve broad, and two deep, 

 through which they turn the water that is 

 drawn from the beds of copper, which is 

 highly impregnated with the metal. The 



* Mr. Aikin, in his Journal of a tour through 

 North Wales, p. 140, which I have lately feen, 

 fays, that there are here works for making green 

 vitriol and alum in fmall quantities, the property 

 of a feparate company, but to thefe ftrangers are 

 not admitted. Before this work came into my 

 hands I had not heard of them, 



iron 



