610 



Mr. H. E. Sohmfts 



the 



Table I b. — Soft Wires. 

 Electromotive force in microvolts o£ circuit of three metal?. 



Temperature of Junction. 



Electromotive Force. 



Copper-Iron. 



Iron-G.S. 



G-.S.-Copper. 



Observed. 



Calculated * . 



o 

 60 



7-85 



o 







4- 4917 



4- 487-2 



60 







7-99 



4- 753 6 



4- 753 9 



8-18 



o 



60 



4- 816-5 



4- 813 5 







8-20 



60 



4- 533-35 



4- 528 9 







60 



8-28 



-12926 



-1292-0 



8-31 



60 







-1275-7 



-1284-0 



* From equation (6), which is here used since the values a x , b v a 3 , b 3 for 

 Copper-Iron and G.S.-Copper are deduced from more observations than the 



Table II a. — Hard Wires. 

 Electromotive force in microvolts of pairs of metals. 





E.M.F. observed. 



E.M.F. calculated * . 



Copper-Iron 0-20 



0-60 



0-80 



Iron-G.S. 0-20 



0-60 



0-80 



G.S.-Copper 0-20 



0-60 



0-80 



224-5 

 6390 



825-4 



- 460-3 



-1390-8 

 -1863-3 



237-5 

 756-05 

 1037-5 



226-3 



638-3 

 825-9 



- 459-8 

 -1391-4 

 -1863-1 



237-4 



756-2 



1037-5 



Copper-Iron a=4-ll'580, 6=--03142 



Iron-G.S a= -22*891, &=- -00995 



G.S.-Copper a =4-11-506, b =4- -03657 



* Method of least squares. 



Table II b. — Hard Wires. 

 Electromotive force in microvolts of circuit of three metals. 



Temperature of Junction. 



Electromotive Force. 



Copper-Iron. 



Iron-G.S. 



G.S.-Copper. 



Observed. 



Calculated * . 



o 

 60 



8-46 



o 

 



+ 441-3 



4- 444-1 



60 







8-56 



4- 728-4 



4- 738-0 



9-01 







60 



4- 878 2 



4- 859-2 







8-26 



60 



4- 577-1 



4- 566-8 







60 



8-30 



-1298-2 



-1294-6 



8-38 



60 







-1283-9 -1295-5 



From equation (5). 



