234 Tables 209-21 1 



TABLE 209. — Weight in Grams of a Cubic Meter of Saturated Aqueous Vapor 



TABLE 210. — Weight in Grains of a Cubic Foot of Saturated Aqueous Vapor 



Tables are abridged from Smithsonian Meteorological Tables, fourth revised edition. 



TABLE 211. — Pressure of Aqueous Vapor in the Atmosphere 



For various altitudes (barometric readings). 



The first column gives the depression of the wet-bulb temperature t\ below the air temperature t. The 

 value corresponding to the barometric height at the altitude of observation is to be subtracted from the 

 vapor pressure corresponding to the wet-bulb temperature taken from Table 208. The temperature 

 corresponding to this vapor pressure taken from Table 208 is the dew point. The wet bulb should be 

 ventilated about 3 meters per second. For sea-level use Table 212. Example: t = 35% h = 30°, barome- 

 ter 74 cm. Then 31.83 — 2.46 = 29.37 mm = aqueous vapor pressure; the dew point is 28.6° C. 

 Abridged from Smithsonian Meteorological Tables, 1907. 



Smithsonian Tables. 



