[ 435 J 



And in general the weight of 1000 inches, barometer 30 being 

 given, the weight at any proportional part of 30 may be found, 

 it being the fame proportional part of the weight at 30. 



Thus tW weight at barometer 30 is 329,855 then 20 being -^ of 

 30 the weight at barometer 20 is 4- of 329,855 grains— 219,8 grains 

 as in the table. The weight at barometer 10 (being 2. of 30) 

 is 109,7 grains, the weight at barometer i is 10,99, ^^^^ weight 

 at barometer o, I is i, 099 grams. 



The weight of 1000 inches {landing on a bafis. of onie fqiiare 

 inch, barometer 30 is 329,855 grains. 



Mle. . 



