BOOK VIII. 



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. 



