[ 43^ ] 



Nate. — Alfo that rooo inches =.83,3333 feet {landing on the 

 ^ame bafis, and confequently poflefs the fame weight, as do aifo 

 1:^,8888 fathom. 



Problem, I. 



To find the height that mercury would fland at, in a ba- 

 rometer at a given elevation in the atmofphere, the height at 

 which it Hands at the bottom of that elevation being alfo given, 

 and the mean temperature of the air being alfo 32"^. 



Solution. 



If the height be given in feet or inches, convert them into 

 fathoms or parts of a fathom. Subtradl thefe fathoms (or parts 

 of a fathom) from the log. of the height of the lower baro- 

 meter, the remainder will give a logarithm belonging to the 

 natural number, denoting the inches at which mercury ftioiild 

 ifiaad in a barometer on that elevation. 



Example. 



Barometer below being at 30 inches, at what height fhould 

 mercury ftand, on an elevation of 1000 feet? Mean tempe- 

 rature 32*^. 



Here 



