[ SOI ] 



Notes — i*^. The degrees of heat here mentioned are thofe of 

 Reaumur. 



2do. That the point of faturation is here fuppofed to be C. 



3tio. That the fecond column expreffes the diftance from fatu- 

 ration, that is, the number of degrees by which the heat muft be 

 diminifhed to raife the hygrometer to C. As the degrees here men- 

 tioned are thofe of Reaumur, thefe and thofe of Fahrenheit muft 

 be converted into each other as occafion may require*. 



Vol. Vlir. 3 R Qf 



* To convert Fahrenheit's degrees into thofe of Reaumur, when higher than 32° 

 fubftraft 32, and divide the remainder by 2,23, the quotient is the degree of 

 Reaumur on the Geneva Thermometers. — If the degrees^ of Fahr. be below 3 2 fub- 

 ftraft them from 32 and divide the remainder by 2,23. 



To convert the degrees of Reaumur into thofe of Fahr. if above o, multiply them 

 into 2,23 and add 32 to the produft — If below o, multiply them into 2,23 and fub^ 

 ftraft the produdt from 32, the remainder expreffes the degree of Fahrenheit. 



