﻿22 Prof. E. Edlund on the Electromotive Force 



4. Experiment 1. — The wire experimented with consisted of 

 copper and iron soldered together with tin. The numbers under 

 the head " deflections v are the differences between the two posi- 

 tions of equilibrium of the column of liquid when the current 

 went in opposite directions. These numbers are therefore pro- 

 portional to the quantities of heat sought. In all the follow- 

 ing experiments the copper wire used was taken from one and 

 the same coil. The wire was 1 millim. in diameter. The dia- 

 meter of the iron wire was about the same. When the posi- 

 tive current went from copper to iron the place of soldering 

 was cooled. The column of liquid, both in this and the three 

 following experiments, consisted of spirit, for which reason they 

 are not accurately to be compared with the later experiments. 



Deflections. 



19*2 



17-5 



190 



Mean . . 18-6 

 Intensity of current = tg. 44° 6 ; . 

 Experiment 2. — The same wires as before. 



Deflections. 

 11-7 

 15-5 

 11-5 



Mean . . 12*9 

 Intensity of current = tg.32° 30'. 

 Experiment 3. — The same wires. The experiment was made 

 on the following day. 



Deflections. 

 17*8 

 18-0 

 19-3 

 21-5 

 20-3 



Mean . . 19*4 



The intensity of the current = tg. 45°. 

 Experiment 4. — The same wires as before. 



Deflections. 

 13-0 

 12-5 

 13-0 

 122 

 12-0 



Mean . . 12'5 

 Intensity of current = tg. 31° 25 . 



