40 



VETERINARY HYGIENE 



multiplied by Glaisher's factor (/), the dew point can be determined 

 by the formula : 



Temperature of air dew point temperature 

 Temperature of dry bulb temperature of wet bulb"' 



and from the temperature of the air and the dew point the relative 

 humidity can be calculated by means of a table of standard vapour 

 pressures. 



The following tables give Glaisher's factors for different 

 temperatures of the dry bulb and tension of aqueous vapour in 

 inches of mercury for different temperatures : 



GLAISHER'S FACTORS. 



