370 



BOOK IX. 



A — Lever which when depressed by means of a cam compresses the bellows. 

 B — Slots through the posts. C — Bar. D — Iron implement with a rectangular 

 LINK. E — Iron instrument with round ring. F — Handle of bellows. G — Upper 

 post. H — Upper lever. I — Box with equal sides. K — Box narrow at the 

 bottom. L — Pegs driven into the upper lever. 



one and a half palms thick. There are mortised into this longitudinal beam 

 the lower ends of upper posts three palms wide and two thick, which are six 

 feet two palms high, exclusive of their tenons. The upper ends of these 

 posts are mortised into an upper longitudinal beam, which lies close under 

 the rafters of the building ; this upper longitudinal beam is two palms 

 wide and one thick. The upper posts have a slot cut out upward from a 

 point two feet from the bottom, and the slot is two feet high and six digits 

 wide. Through these upper posts a round hole is bored from one side to 

 the other at a point three feet one palm from the bottom, and a small iron axle 

 penetrates through the hole and is fastened there. Around this small iron 

 axle turns the second lever when it is depressed and raised. This lever is 

 eight feet long, and its other end is three digits wider than the rest of the 

 lever ; at this widest point is a hole two digits wide and three high, in which 

 is fixed an iron ring, to which is tied the rope I have mentioned ; it is five 

 palms long, its upper loop is two palms and as many digits wide, and the 



