INTRODUCTORY CHAPTER. 



XXXVll 



degrees is discussed in the Forces of Nature (vide Heat, Book IV., 

 Chapter i.). The following facts may be found useful : 



1 Fahrenheit = 

 1 Centigrade = 

 1 Reaumur = 



0'55 C. = 

 O80 K. = 

 1'2 = 



0'44 11. 

 1'80 F. 

 2'25 F. 



Centigrade degrees 

 Reaumur 

 Fahrenheit 



> M 



Centigrade ,, 

 Reaumur 



-4-5x9 + 



-5-4x9 + 



-32-4-9 X 



-32-4-9 X 

 -4-5x4 

 -T- 4 X 5 



32 



32 



5 



= Fahrenheit degrees. 



4 = 



Centigrade ,, 

 Reaumur 



M 



Centigrade 



