BOOK VI. 



165 



A UPRIGHT BEAMS. B SILLS LAID FLAT UPON THE GROUND. C POSTS. D AREA. 



E SlLL 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). 



