Practical Thermometrio Standard. 



533 



Note to Fig. 1. — These curves may be utilized for calibrating a meldo- 

 . meter or a thermocouple by means of a single observation such as the 

 F.P. of silver or gold, in the following manner: — The parabolic difference- 

 curve of the expansion method (1) is represented by the formula 



*— ^'=0-0001 59 <(<- 1000) (1) 



Phil. Mag. IS. 5. Vol. 48. No. 295. Dec. 1899. 2 P 



