PSYCHROMETRICAL TABLES. 



2. Dry thermometer, t = 88. 5 F. 



Wet thermometer, t' = 76 .3 F. 



Difference, t t>= 12.2 F. 



Page 63, Table gives for t t' 12 and t 1 76 ' '== 0.735 inch. 

 Add for fraction of t' = 0.3, 0.003 X 3 = 0.009 



Subtract for fraction of t t' = 0.2, .0013 X 2 = 0.003 



Force of vapor in the air = 0.741 

 Relative humidity = 55 



3. Dry thermometer, t 4.5 F. 



Wet thermometer, t' = 6.0 F. 



Difference, t t'= 1.5 F. 



Page 50, Table gives for t t i = 1.5 and t' = 6 = 0.016 inch. 

 Subtract for fraction of t 1 = 0.5, 0.0002 X 5 = 0.001 



Force of vapor in the air = 0.015 

 Relative humidity = 45 



B 49 



