238 Tables 21 3 (concluded) and 214 



TABLE 213 (concluded) — Relative Humidity, Vapor Pressure and Dry Temperature 



TABLE 214. — Relative Humidity, Wet and Dry Thermometers 



This table gives the relative humidity direct from the difference between the reading of the dry (t ° C) and the wet 

 (ti ° C) thermometer. It is computed for a barometer reading of 76 cm. The wet thermometer should be ventilated 

 about 3 meters per second. From manuscript tables computed at the U.S. Weather Bureau- 



Smithsonian Tables. 



