258 



A. W. Davison 



Lead-Nickel couple (fig. 12). Resistance, .193 ohm. Current 

 goes from Nickel to Lead in the hot junction. Junctions (e) and 

 (g) at 0. S = 2100 ohms, so (d) = .00002383. 



(1) 



(2) 



(3) 



.0000000 

 .0002465 

 .0005805 

 .0016365 

 .0019515 

 .0025815 

 .0030465 

 .0033715 

 .0037565 

 .0040565 

 .0043765 

 .0047265 

 .0049965 

 .0051066 

 .0052461 

 .0054663 

 .0056565 

 .0057467 

 .0058215 



Measurements of this junction by the potentiometer gave the 

 following results: 110°, .0020137; 245°, .0049305. 



Values of B and c taken from the readings at 110 and 252 

 degrees, are: 



b = -16.125 X 10-6 



c = -14.69 X 10-9 



Iron Lead Couple (fig. 12). Resistance, .96 ohm. Current goes 

 from lead to iron on the hot junction. S = 599 ohms. (The 

 value of aS + the resistance of the couple = 600 ohms). Junc- 

 tions (e) and (g) at 0. Since res. = 600, (d) = .0000102814 v. 

 per mm. 



