336 The Us e s 



* quaintcd with the nature of your pyrites, as all 

 ? of them cannot equally with profit be worked for 



* fulphur - 9 alfo know, what quantity may be lodg- 



* ed in at once and burnt in eight hours. When 

 4 eleven pipes are employed, for the week about 

 4 126 centners of pyrites mult be worked, eighteen 



* centners for the twenty-four hours, and fix cent- 



* ners worked each time for eight hours. From 

 4 pyrites of an ordinary yields there may in a week 



* about five and a half centners of fined fulphur be 



* procured, the centner of pyrites reckoned at four 



* and 1 half pounds. The pipes, as was faid, mud 

 4 be made of good Huff, and not overcharged, as 

 4 the pyrites is apt to fwell and heave, which 



* might endanger the pipes. Alfo the arch, next 

 4 over the upper pipes, to be left open, there be- 

 4 ing then a greater degree of heat, and a better 



* drift of fulphur procured. 



6 The crude fulphur, when there is a quantity of 



* it together, is done out of the lead pans into ob- 



* long fining pots of iron, which are lodged in the 



* fining- furnace, and fitted with clay-helms and 

 c earthen receivers ; and thus the fulphur driven 

 4 or forced off, and then from the receivers tapped 



* off into other pots, wherein it is fufTered to cool 

 4 a little •, after which it is caft in moulds, in long 

 4 rolls, and packed up in vefTels : in the fining 

 4 there is a fifth part wafte. In the fining-pots, af- 

 4 ter forcing off the fulphur, there remains behind 



* the drofs, called fulphur-Jlags •, which, whilft (till 

 4 hot, are to be removed with an iron ladle. The 

 4 pyrites thus worked is thrown afide, and fome of 



* it ufed as additions in the operation of crude- 

 4 fmelting, and the reft of it boiled for vitriol ; but 

 4 what is defigned for this laft, muft lie for thir- 

 4 teen weeks in the open air before it can be ufed. 5 



The 



