APPENDIX O 



COMPARISON OF FAHRENHEIT AND CENTIGRADE 

 THERMOMETER SCALES 



To change Centigrade to Fahrenheit : (C. x f ) + 32 = F. For example, to 

 find the eqmvalent of 10° C, (10° x f ) + 32 = 50° F. 



To change Fahrenheit to Centigrade : (F. — 32°) x ^ = C. For example, to 

 reduce 50° F. to Centigrade, (50° - 32°) x f = 10°C ; and - 40° F. to Centigrade, 

 (- 40° - 32°) = - 72°, whence - 72° x | = - 40° C. 



164 



