2(53^ 



FORCE OF VAPOUR. 



32®; the feconcI,to determine the comparative forces of vapour 



from other liquids. Thefe enquiries feemed independent of 



each other ; notwithflanding which I found them in reality 



connected. 



Examination of Upon examination of the numbers in the tablC;, Avithin the 



o/the'forceof li^nits jufl mentioned, there appears fomething like a geo- 



vapour, metrical progreilion in the forces of vapour ; the ratio, 



however, inftead of being conftant, is a gradually diminifh- 



ing one : thus the 



Force at 32^ = ,200 inch. 

 17. 

 122 = 3. 500 



'. 50") 



> Ratios, 



?. 57 J 



212 == 30. 000 



If we divide thefe ratios, according to obfervation^ they will 

 ftand thus: 



' Force at 32° = ,200 inch. 



4. 550- 

 77 = ,910 



3. 846 



122 = 3. 500 



Ratios. 



3. 214 



167 

 212 



= 11. 250 



2. 666 J 



30. 000 



If we divide thefe again, they become, 



' Force at 32° = ,200 inch. 

 2. 17^ 



2. 09 



54t = 





,435 



77 = 





,910 



99| = 



1. 



820 



122 = 



3. 



500 



144i = 



6. 



450 



167 = 



n. 



250 



1891 = 



18. 



800 



^12 = 



30. 



000 



2. 00 



1. 92 



I. 84 



I. 75 



1. 67 



1. 59^ 



} Ratios. 



By 



