BOOK V 



A UPRIGHT FORKED POSTS. B POLE OVER THE POSTS. C SHAFT. D FIRST CORD. 

 E WEIGHT OF FIRST CORD. F SECOND CORD. G SAME FIXED GROUND. H HEAD 



OF FIRST CORD. I MOUTH OF TUNNEL. K THIRD CORD. L WEIGHT OF THIRD CORD. 



M FIRST SIDE MINOR TRIANGLE. N SECOND SIDE MINOR TRIANGLE. O THIRD SIDE 



MINOR TRIANGLE. P THE MINOR TRIANGLE. 





