36 



Example. 



Suppose the barometer at the bottom of the mountain 

 to stand at 30 inches, thermometer 60 ; the barometer 

 at the top 26-36 inches, thermometer 46 ; required the 

 height of the mountain, say Snowdon. The mean of 

 the two barometers, or A, is 28-18 inches; their differ- 

 ence, or , 3*64 inches ; and the mean of the two ther- 

 mometers, or b, 53. In Table II. 913*0 is opposite to 

 53; therefore 



30x3-64x913-0 



28-18 



= 3538-0 feet. 



Table of Factors for deducing the Dew-point from the tem- 

 perature of the air and the temperature of evaporation. 

 (From the " Greenwich Magnetical and Meteorological 

 Observations," 1844.) 



