Table 46. 



REDUCTION OF SNOWFALL MEASUREMENTS. 



Depth of water corresponding to the weight of snow (or rain) collected 



in an 8-inch gage. 



Table 47. 



RATE OF DECREASE OF VAPOR PRESSURE WITH ALTITUDE. 



{According to the empirical fonnula of Dr. J. Hann), 



i--- 



h 

 6517' 



fifo = Vapor pressures at an upper and a lower station respectively. 

 h = Difference of altitude in metres. 



Smithsonian Tabues, 



146 



