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



Experiment 16. 

 s = tan 19° 17'. 



Experiment 17. 

 s=tanl2° 18'. 



Experiment 18. 

 s= tan 6° 0'. 



Deflections. 



Deflections. 



Deflections. 



391 

 384 

 386 



2575 



25-85 

 25-55 



14-65 

 14-50 

 14-55 



Mean ... 387 



2572 



14-57 



The value of /3 = 4-815 ; with this we obtain 

 a = 139-45 from Exp. 16. 

 « = 130-77 „ 17. 



a = 142-26 „ 18. 



Mean . . a = 137*49 

 Experiments were also made with intervals of 45 minutes, 

 and furnished the following result : — /3 = 4*991 and 



* = 178*52 with s=tan21 12 

 a = 176-90 „ s=tanl5 8 

 a = 178-62 „ s= tan 7 33 



Mean . . a = 178*01 



The ratio of the two values of a is 1*29, which is, within the 

 limits of errors of observation, equal to the ratio found with the 

 iron-copper combination. Hence the method with shortened 

 time between two successive readings gives a sufficiently exact 

 result. 



With the thermoelectric experiments the following deflections 

 were obtained : — 



Experiment 19. — No. 1. 



Temperature- 

 differences. 



Deflections. 



Conducting-power. 



10-5 

 10-3 

 10-2 

 100 



188-5 

 1851 

 179-7 

 178-3 



213-2 

 213-4 

 213-4 



Mean... 10-23 



182-9 



2133 



Experiment 20.— No. 2. 



11 1 

 110 

 10-9 

 10-8 



232-4 

 230-6 

 228-4 

 225 



2123 

 2128 

 2124 



Mean... 1095 



229-1 



2127 



