THERMOMETRICAL TABLES. Xlll 



To convert i6°o. Centigrade to Approximate Absolute, Fahrenheit, and 

 Reaumur. 



From the table, 16? C. = 289° A. A. = 6o°8 F. = I2°8 R. 



From the proportional parts 0.9 = 0.9 = 1.6 = 07 



16.9 C.= 289.9 A.A. = 62.4 F. - 13.5 R. 



Or, i6° 9 X 2 (1 - ^) + 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. - 6o° C. = 48? 22. 



From the proportional parts 7.7 = 4.3 = 4.3 = 3.4 



147.7 F. = $37.3 A. A. - 64.3 C. =51-4 R- 



0r , '47-7 - 32.o j_ J_ _2_ } = 



2 v 10 100 1000 , „ 



+ 5-78 



+ .58 

 + ^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 18.3 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 



18.3 R. - 295.9 A.A. = 22.9 C. = 73.2 F. 



Or, 18.3 X 7 = ^T = 22.9 C, and (18.3X?) + 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 — I20°9 F. 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. 



