Forces of some Metallic Alloys in Contact with Copper. 37 

 In the first determination ft was =6*336, and 



a = 255-46 with s=tanl8 22 



«=235-28 

 a = 249-89 



5= tan 12 05 

 s=tan 5 32 



Mean . . a=246*88 

 The electromotive force of the alloy appears therefore to dimi- 

 nish with time. 



The thermoelectric experiments gave the following result : — 





Experiment 14. — No. 



1. 



Temperature- 

 differences. 



Deflections. 



Conducting-power. 



100 

 9-9 

 97 

 9-6 



143-6 

 141-4 

 1400 

 138-2 



93-4 

 93-2 

 93-2 



Mean ....9-8 



140-8 



93-3 





Experiment 15. — No 



.2. 



108 

 107 

 10-6 

 10-5 



1428 

 141-6 

 1410 

 139-4 



93-2 

 940 

 93-8 



Mean ... 1065 



141-2 



937 



The deflections, reduced, are : — 



For No. 1, =246-38 

 „ 2, =226-39 



Mean . . =236-39 



From the first experiments it follows that : — 



No. 1. Reduced deflection =252*98 

 No. 2. „ „ =229-53 



Mean . . -=241*26 



Consequently the thermoelectric, like the electromotive force, 

 proved somewhat smaller in the later experiments than in those 

 first made. 



Alloy No. 2 and Copper. 



The elements of this alloy were 4 parts bismuth and 1 part 

 tin. The electromotive force was ascertained by the following 

 experiments : — 



