TABLES FOR THE USE OF MASON'S HYGROMETER. 



TABLE OF DEGREES. 



By the TABLE OF DEGREES is shown, without 

 calculation, the absolute dryness of the atmosphere, 

 in degrees of Fahrenheit's Thermometer. 



Observe the NUMBER OF DEGREES THE TWO 

 THERMOMETERS DIFFER, which are here called 

 "degrees of dryness observed," and found IN THE 

 FIRST COLUMN, of .the table. 



The second column merely contains the figures 

 which, have been added to the degrees of dryness 

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