HYGROMETRICAL TABLES. 



Reduction of psychrometric observations — English measures. 



Values of e = e' - 0.000367 B{t - t')(\ + l ~ 32 J . . Table 75 



Relative humidity — Temperature Fahrenheit .... Table 76 



Reduction of psychrometric observations — Metric Measures. 



Values of e = e' — 0.000660 B (t — t') (1 + 0.00115 t') . Table 77 



Relative humidity — Temperature Centigrade .... Table 78 



Rate of decrease of vapor pressure with altitude Table 79 



Reduction of snowfall measurements. 



Depth of water corresponding to the weight of a cylindrical 



snow core 2.655 inches in diameter Table 80 



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



collected in an 8-inch gage Table 81 



Quantity of rainfall corresponding to given depths . . . Table 82 



