40 M. A. F. Suudell on the Electromotive and Thermoelectric 

 The thermoelectric force. — 



Experiment 24. — No. 1. 



Temperature- 

 differences. 



Deflections. 



Con ductin g-power. 



o 



10-4 

 10 3 

 101 



65-8 

 64-8 

 63-8 



I960 

 196-2 

 I960 



Mean... 1027 



64-8 



1961 



Experiment 25. — No. 2. 



10 3 

 10-2 

 100 



65-2 

 64-6 

 63-8 



196-8 

 1962 

 196-2 



Mean... 10-17 



64-53 



196-4 



The deflections become when reduced : — 

 For No. 1, =51-48 

 „ No. 2, =51-69 



Mean . . =51-59 



The diminution of the electromotive force of this alloy was 

 particularly great ; for the first determination gave a = 94'34, a 

 value nearly twice as much as the one found above. The ther- 

 moelectric force was also at the commencement much greater ; 

 for the deflections became when reduced: — 



For No. 1, =78-76 

 „ No. 2, =75-08 



Mean . . =76-92 



In order to verify the presence of the alteration in question, 

 special experiments were made with this alloy. Three rods were 

 cast at the same time, and soldered to copper wires. Two of 

 these pairs of wires were inserted in the air-thermometer. In 

 the following days the electromotive force was determined, and 

 also simultaneous thermoelectric experiments made with the 

 third pair of wires. 



Experiment 26, on the 28th of February, directly after the 

 casting. — With the current-intensity s = tan 20° the mean de- 

 flection 34'43 was obtained. The reduced deflection of the 

 thermoelectric current was 120*24. 



Experiment 27, on the same day, about 5 hours later. — De- 

 flection with 5= tan 20° 10', 3033. Reduced deflection of the 

 thermoelectric current = 113'39. 



