BOOK VIII. 



313 



A MORTAR. B OPEN END OF MORTAR. C SLAB OF ROCK. D IRON SOLE PLATES. 

 E SCREEN. F LAUNDER. G WOODEN SHOVEL. H SETTLING PIT. I IRON 

 SHOVEL. K HEAP OF MATERIAL WHICH HAS SETTLED. L ORE WHICH REQUIRES 



CRUSHING. M SMALL LAUNDER. 



