[ =98 ] 



of water except about two inches 

 from the brim. 



Fig. VIII. The board (exprefTed 

 by #, in Fig, VII.) by itfelf, and 

 inverted. It has two funnels hol- 

 lowed out on its under-part, which 

 is in this figure reprefented upper- 

 moft : the orifices of the funnels 

 are reprefented by the two round 

 holes, one of which mult be larger 

 than the other, a a reprefent two 

 oblong incifions to receive the ex- 

 tremity of the bended tubes, through 

 which the various kinds of air are 

 let up into the inverted jars placed 

 upon the board. 



Fig. IX. A cut of the two fun-* 

 nels hollowed out in the board, re- 

 prefented by Fig« VIII. 



The 



