THERMOMETRICAL TABLES. XVll 



To convert i6°9 Centigrade to Approximate Absolute, Fahrenheit, and 

 Reaumur. 



From the table, i6? C. = 289°^.^. = 6o°8 F. = I2°8 R. 



From the proportional parts 0.9 = 0.9 = i-6 = 07 



16.9 C.= 289.9 A. A. = 62.4 F. = 13.5 i?. 



Or, I6°9 X 2 (I - ^) + 32 = 33-8 



- 34 

 32.0 



62.4 F. 



To convert I47°7 Fahrenheit to Approximate Absolute, Centigrade, and 

 Reaumur. 



From the table, 140° F. = 333° A. A. = 60° C. = 48° R. 



From the proportional parts 7.7 = 4.3 = 4-3 = 3-4 



147.7 F. = 337-3 ^4.^. = 64.3 C. = 514^- 



1477 - 32.0 (^ ^ ^ J_ ^ _^ ^^^_) ^ 8 



' 2 ^10 100 1000 , „ 



+ 578 



+ .58 

 + x)6 



64.27 C. 



Fahrenheit may also be reduced to Approximate Absolute by obtain- 

 ing its equivalent in Centigrade from Table 2 and adding 273 to the result. 



To convert i8°3 Reaumur to Approximate Absolute, Centigrade, and 

 Fahrenheit. 



From the table, 16° R. = 293° A.A. = 20° C. = 68° F. 



From the proportional parts, 2.3 = 2.9 = 2.9 = 5-2 



T8.3 R. = 295.9 A.A. = 22.9 C. = 73.2 F. 



Or, 18.3 X ^^ = 5^ = 22.9 C, and (i8.3X^) + 32 = ^^+ 32 = 73-2 F. 

 4 4 4 4 



TABLE 2. 



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

 Centigrade. 



The conversion of Fahrenheit temperatures to Centigrade temperatures 

 is given for every tenth of a degree from + I30°9 F. to — 120-9 P- The 

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

 ment, 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. 

 2 



