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.