34 M. A. F. Sundell on the Electromotive and Thermoelectric 



taken place in the apparatus. There was then obtained fi= 2*976 

 and 



a=86*87 with s=tan31 1 



a = 81*27 „ s=tan20 18 



* =84*24 „ s=tanlO 13 



Mean . a. = 84* 13 



The mean value of the two determinations is a = 82*36. 

 Professor Edlund obtained a = 130*99. The ratio of these values 

 is 1-59. 



The electromotive force of this combination was also deter- 

 mined from readings with intervals of 45 minutes. 



As the result of these experiments I obtained /3= 2*156 and 



a = 106*4 with 

 « = 100*5 „ 

 a = 104*6 „ 



= jtau30 21 

 = tan 19 55 

 = tan 10 28 



Mean 



«= 103*83 



The ratio of the two values of a. obtained according to the 

 two different methods is 1*26. 



The determination of the thermoelectric force in the way above 

 given furnished the following result : — 



Experiment 4. — Fair of wires No. 1. 



Temperature-differences 

 of the contacts. 



Thermoelectric-current 

 deflections. 



Conducting-power 



(inducing-magnet 



deflections). 



10-2 



101 



9-9 



98 



111-2 

 109-4 

 108-4 

 1074 



1980 

 1980 

 1976 



Mean ... 10-0 



1091 



1979 



Experiment 5. — Pair of wires No. 2. 



8-9 



87 

 8-6 

 8-4 



94-0 

 910 



88-8 

 86-6 



1984 

 1990 

 197-6 



Mean ... 8-64 



90-1 



198-3 



i 



In all the following experiments we shall take the deflections, 

 reduced to the temperature-difference 10° C. and the conducting- 

 power 160, as relative measures of the thermoelectric forces. 

 The magnitude of this force of the combination iron-copper is 



