16 



CIRCULAR 619, U. S. DEPARTMENT OF AGRICULTURE 



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Figure 3. — Pounds of drv air and of water vapor per cubic foot, at a barometer 

 reading of 29.921 (based on table 1, p. 430, v. 1, of Mechanical Equipment of 

 Buildings, by Luis Allen Harding and Arthur Culls Willard, 1917). 



Example: To find the temperature at which the air under the 

 foregoing conditions would reach 100 percent saturation. 



