TABLE OF CORRECTIONS. 



TO BE USED WHEN THE TERM OF DEPOSITION, OR 



DEW-POINT, DIFFERS FROM THE TEMPERATURE 



OF THE AIR IN THE SHADE. 



RULE. To find the weight of moisture in a 

 cubic foot of air at any time. Divide the weight in 

 grains found opposite to the temperature, corres- 

 ponding to the dew-point at the time, in the table 

 of quantity, by the correction found opposite to 

 difference of temperature in the table of corrections, 

 corresponding to the absolute dryness existing at 

 the time. 



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