Forces of some Metallic Alloys in Contact with Copper. 45 



Eleven days previously the thermoelectric force was deter- 

 mined at 680-93, and the electromotive at 521*23. This alloy 

 appears therefore to be as little variable in relation to its elec- 

 tromotive properties as the preceding bismuth-antimony. This 

 was confirmed by a special thermoelectric experiment. Imme- 

 diately after casting, the reduced deflection 613*87 was obtained, 

 and five days afterwards the deflection 624*13. The difference 

 does not amount to 2 per cent. ; so that they may be regarded 

 as not essentially different. 



Copper and German Silver. 



The copper wire was soldered to a German-silver wire of the 

 same thickness (1 millim.) . This combination was tried only once. 



The electromotive force. — 



Experiment 45. 

 s=tan23° 30'. 



Experiment 46. 

 s= tan 15° 16'. 



Experiment 47. 

 s=tan7° 10'. 



Deflections. 



Deflections. 



Deflections. 



32-60 

 32-70 

 32-35 



21-75 

 21-95 



1205 

 1205 

 1215 



Mean ... 32-55 



21-85 



1208 



The constant /3= 4*556; and 



* = 102*13 from Exp. 45, 



«= 92*65 

 a= 99*47 



46, 



47. 



Mean . «= 98*08 , 

 The thermoelectric force. — 



Experiment 48. — No. 1. 



Temperature- 

 Differences. 



Deflections. 



Conducting-power. 



o 



119 

 11-4 

 11-3 

 111 



158-8 

 151-8 

 150-8 , 

 149-6 



210-2 

 2100 

 209-8 



Mean... 10-43 



15275 



2100 



Experiment 49. — No. 2. 



110 

 10-6 

 10-3 



153-2 

 145-4 

 138-2 



209-2 

 210-6 



Mean... 10-63 1 145-6 



209-9 



