E 301 ] 



which ferves to receive the mer- 

 cury fpilt by moving the vefTels 

 in the other box. 



Fig. XI. The board (reprefented 

 by c in Fig. X.) of the box con- 

 taining mercury, reprefented in a 

 as it is fixed in the box ; and in- 

 verted in b, on purpofe to fee the 

 funnel hollowed out in the under- 

 lide of it. 



Fig. XII. A fection of the board 

 of the box (reprefented by Fig. X. 

 cj 9 on purpofe to fhew the form of 

 the funnel, and the manner of fix- 

 ing this board in the box, by let- 

 ting its floping edges in a groove 

 cut out in the fubflance of the box, 

 fo that the mercury cannot pufli 

 it up, but that it may be taken 

 out at pleafure. 



Fig. XIII. 



