BOOK XL 



527 



and hold it, lest it should fall out of the beam ; that end is hardly a digit 

 thick, while the other round end is thicker than a digit. When the door is 

 to be shut, this pin hes under the timber and holds the door so that it cannot 

 fall ; the pin Ukewise prevents the rectangular iron band which encircles the 

 end of the beam, and into which is inserted the ring of a long hook, from 

 falling from the end. The lowest link of an iron chain, which is six feet long, 

 is inserted in the ring of a staple driven into the right wall of the furnace, 

 and fixed firmly by filling in with molten lead. The hook suspended at the 

 top from the ring should be inserted in one of these lower links, when the 

 door is to be raised ; when the door is to be let down, the hook is taken out 

 of that hnk and put into one of the upper links. 



On the third day the master sets about the principal operation. First 

 he throws a basketful of charcoals on to the ground in front of the hearth, 

 and kindles them by adding Uve coals, and having thrown live coals on to the 

 cakes placed within, he spreads them equally all over with an iron shovel. 

 The blade of the shovel is three palms and a digit long, and three palms wide ; 

 its iron handle is two palms long, and the wooden one ten feet long, so that 

 it can reach to the rear wall of the furnace. The exhausted liquation cakes 

 become incandescent in an hour and a half, if the copper was good and hard, 



A — The door let down. B — Bar. C — Exhausted liquation cakes. D — Bricks. 



E — Tongs. 



