138 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 

 TABLES FOR THE USE OF DR. MASON'S HYGROMETER. 



i ~ 

 Q 



CD 



* 





St. , ^ - s 



C -3 ^"'- 





TABLE OF DEGREES. 



The comparison of Mr M ison's with the *Dew Point Hygrometer, and of Sir 

 /ob"\ Leslie's, will be seen in the same line of the 1st. 3d, and 4th columns of the 

 JV fe. 



itofessor Daniell's Hygrometer is registered by the 3d column. 



