Analyfis of the Air. ioy 



depths, down to the greateft depth that a 

 line will reach, thereby to difcover, whe- 

 ther or how much the fpring of the air is 

 difturbed or condenfed, not only by the 

 great preffure of the incumbent water, but 

 alfo by its coldnefs at great depths j and in 

 what proportion, at different known depths 

 and in different lengths of time , that an al- 

 lowance may accordingly be made for it 

 at unfathomable depths. 



This gage will alfo readily fhew the de- 

 grees of compreffion in the condenfing en- 



gine. 



But to return to the fubject of the two laft 

 Experiments, which prove the elasticity of 

 this new generated air $ which elafticity is 

 fuppofed to confift in the active aerial par- 

 ticles repelling each other with a force* 

 which is reciprocally proportional to their 

 diftances. That illuftrious Philofopher, Sir 

 Ifaac Newton, in accounting how air and 

 vapour is produced, Opticks (guer. 3 1 . fays, 

 " The particles when they are fliaken off 

 " from bodies by heat or fermentation fo 

 " foon as they are beyond the reach of the 

 * £ attraction of the body receding from it ? 

 " as alfo from one another , with great 



" ftrength 



