LEAD 



73 



conducting the reduced metal into the lead-pot o, which is kept heated by means of 

 a fire beneath. 



1354 



The total cost of elaborating one ton of hard lead, containing 30 oz. of silver per 

 ton, in a locality in which fuel is obtained at the low price above quoted, Is nearly as 

 follows : 



& s, d. 



Calcining 2 4'4 



Crystallising 9 6*5 



Eefining 9'2 



Reducing pot dross and litharge . .010-8 



Calcined dross 008-0 



Slags -.005-0 



Bone-ash, &c 7'0 



Transport, &c. 1 I'O 



Management, taxes, and interest of plant . .05 10-0 



Total 

 One hundred tons of hard lead treated gave : 



1 2 3-9 



Tona. 



Soft lead . . . 94-90 



Black dross . . 4 . 3 '7 2 

 Loss , 1-38 



Total . 



. 100-00 



