Thermo-electric Couples 



259 



E'^^ - 186 + 324c = .00019 



Ef' = 2166 + 46656c = .002181 



h -10.787 X 10-« 



c = 12.875 X 10-3 



From which 



Fig. 13. Curve for Mercury-Lead Junction. 



Mercury Lead couple (fig. 13). Current goes from mercury to 

 lead in the hot junction. Junctions (e) and (g) at 0. 5 =0 

 so (d) = .000003133 v. per mm. *, aS = 350 so (d) = .000005274 

 V. per mm. 



