78 Mr. A. Stansfield on some, Improvements in 



the formula was constructed. The formula of Tait and the 

 formula developed in this paper are both empirical, and are 

 both based on theoretical assumptions. In figures 6, 7, and 

 8, the extent to which these formulae hold can be seen at a 

 glance. The parabolic formula depends on the straightness 



of the -yy curve, which is dotted in figs. 7 and 8, whilst the 



Fig-. 7. 



40,000 



36,000 



32,000 



28,000 - 



24,000 



20,000 



16,000 



12,000 



8,000 



4,000 



200° 400° 600° 800° 1000° 1200° 1400° 



THERMO-ELECTRIC POWER AND CONTACT E. M. F. 

 IN PLATINUM THERMO-COUPLES. 



