BOOK VI. 



165 



A — Upright beams. B — Sills laid flat upon the ground. C — Posts. D — Area. 

 E — Sill set at the bottom of the hole. F — Axle. G — Double cross-beams. 

 H — Drum. I — Winding-ropes. K— Bucket. L— Small pieces of wood hanging 

 from double cross-beams. M— Short wooden block. N — Chain. O — Pole bar. 

 P — Grappling hook. (Some members mentioned in the text are not shown). 



