XU INTRODUCTION. 



Table 2. Conversion of readings of the Fahrenheit thermometer to readings 

 Centigrade. 



The conversion of Fahrenheit temperatures to Centigrade temperatures 

 is given for ever^^ tenth of a degree from + 1 30.° 9 F. to — 7o.°9 F. The 

 side argument is the whole number of degrees Fahrenheit, and the top 

 argument, tenths of a degree Fahrenheit ; interpolation to hundredths of a 

 degree, when desired, is readily effected mentally. The tabular values are 

 given to hundredths of a degree Centigrade. 



The formula for conversion is 



where F" is a given temperature Fahrenheit, and C° the corresponding 

 temperature Centigrade. 



Example : 



To convert 79°7 Fahrenheit to Centigrade. 

 The table gives directly 26.°50 C. 



For conversions of temperatures above 131° i% use Table i. 



Table 3. Conversion of readings of the Centigrade thermometer to readings 

 Fahrenheit. 



The conversion of Centigrade temperatures to Fahrenheit temperatures 

 is given for every tenth of a degree Centigrade from + 5o.°9 to — 50^9 C. 

 The tabular values are expressed in hundredths of a degree Fahrenheit. 



The formula for conversion is 



/r»= |c° + 32' 



where C° is a given temperature Centigrade, and F° the corresponding 

 temperature Fahrenheit. 



For conversions of temperatures above the upper limit of the table, 

 use Tables i and 4. 



Table 4. Co?iversion of readings of the Ce7itigrade thermometer near the 

 boiling point to readings Fahrenheit. 



This is an extension of Table 3 from 9o!'o to loo.'g Centigrade. 



Example : 



To convert 95*74 Centigrade to Fahrenheit. 



From the table. 95°7o C. = 204°26 F. 



By interpolation, 0.04 = 0.07 



95°74 C. = 204^33 F. 



