PSYCHROMETRICAL TABLES. 



85 



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 1 = 12 and *' = 76 = 0.735 inch. 



Add for fraction of t 1 = 0.3, 0.003 X 3 = 0.009 



Subtract for fraction of t f = 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 V = 1.5 F. 



Page 50, Table gives for t t' = 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 43 



