BOOK VIII.

3i3

mm

iCWWWM

F **

fc'Vf

f & o ® o o c

IHllB:

h»n

M

\Wk%

&&BSSSS

mm

mm

•urn

g»\W

ragaaffie

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—Ironshovel. K —Heap of material which has settled. I.—Ore which requires

crushing. M—Small launder.