BOOK VIII. 



291 



A — Workman carrying broken rock in a barrow, ti — First chute. C — First box. 

 D— Its handles. E— Its bales. F— Rope. G— Beam. H— Post. I— Second 

 chute. K — Second box. L — Third chute. M — ^Third box. N — First table. 

 O — First sieve. P — First tub. Q— Second table. R — Second sieve. S — Second 

 TUB. T — Third table. V — Third sieve. X — Third tub. Y — Plugs. 



