i86 



TABLE 189. 

 PRESSURE OF AQUEOUS VAPOR IN THE ATMOSPHERE. 



This table gives the vapor pressure corresponding to various values of the difference / h between the readings of 

 dry and wet bulb thermometers and the temperature li of the wet bulb thermometer. The difference t t\ is given 

 by two-degree steps in the top line, and /i by degrees in the first column. Temperatures in Centigrade degrees, vapor 

 pressures in millimeters of mercury are used throughout the table. The table was calculated for barometric pressure 

 B equal to 76 centimeters. A correction is given for each centimeter at the top of the columns. Ventilating velocity 

 of wet thermometer about 3 meters per second. 



SMITHSONIAN TABLES. 



