Thermo-electric Couples 



261 



El^ = 85b + 7225c = .0001955 

 £'{,50 = 1506 + 22500c = .0003270 



b = - 14.8 X 10-7 



c = 46.5 X 10-10 



From which 



Fig. 14. Upper curve, Climax-Lead Junction. Lower curve, Lead-Manganin 



Lead Copper couple (fig. 15). Resistance, .01 ohm. Current 

 goes from lead to copper in the hot junction. Junctions (e) 

 and (g) at 0. ^ = 350 ohms, so (d) = .000005274 v. per mm. 



