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



Alloy No. 4 and Copper. 

 The constituents were 12 parts bismuth and 1 part tin. 

 The electromotive force. 



Experiment 31. 

 s=tan!9°28'. 



Experiment 32. 

 5= tan 12° 54'. 



Experiment 33. 

 s=tan7° 50'. 



Deflections. 



Defleetions. 



Deflections. 



67-95 

 68-25 



4715 

 50-25 

 47-00 



34-3 

 32-7 

 32-6 



Mean ...68 10 



4813 



33-2 



Calculation gives /3 = 6*866 and 



a = 262-61 from. Exp. 31, 

 a = 245 '09 „ 32, 



q = 256-52 „ 33. 



Mean . . a = 254'74 



The thermoelectric force. — 



Experiment 34. — No. 1. 



Temperature- 

 differences. 



Deflections. 



Conducting-power. 







9-8 

 9-7 

 9-5 



283 

 2770 

 273-4 



1700 

 170-8 

 170-2 



Mean ... 9-67 



277-8 



170-3 



Experiment 35.-— No. 2. 



7-7 

 7-6 



7-5 



2200 

 2174 

 215-2 



1680 

 169-4 

 168-6 



Mean ... 76 



21753 



168-7 



Reduced deflection :— For No. 1, =269-91 

 „ 2, =271-46 



Mean . . =270-69 

 The first determination gave the electromotive force = 256*69 

 and the thermoelectric =266*89, values which differ but little 

 from those obtained later. In order to learn whether this alloy 

 undergoes in the course of time a similar change as the preceding, 

 it was recast and its thermoelectric force investigated. Imme- 

 diately after casting the reduced deflection was 297*63 ; a day 



