Tables 186-188. iSk 



TABLE 186. — Weight in Grams of a Cubic Meter of Saturated Aqueous Vapor. 



TABLE 187. — Weight in Grains of a Cubic Foot of Saturated Aqueous Vapor. 



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



TABLE 188. — Pressure of Aqueous Vapor in the Atmosphere. 



For various altitudes (barometric readings). 



The first column gives the depression of the wet-bulb temperature li below the air temperature I. The value cor- 

 responding to the barometric height at the altitude of observation is to be subtracted from the vapor pressure corre- 

 sponding to the wet-bulb temperature taken from Table 185. The temperature corresponding to this vapor pressure 

 taken from Table 185 is the dew point. The wet bulb should be ventilated about 3 meters per second. For sea-level 

 use Table 189. Example: I = 35', ti = 30°, barometer 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 Tablesi 



