284 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



the Other, and the result given for the temperature 74°. 9 was thus 

 obtained. This result agrees well enough with the others to indicate 

 that there was no large difference in behavior of the two bars at the 

 high temperatures. Previous trial had shown that they gave nearly- 

 equal effects at low temperatures. The one value here given for the 

 thick bar was used with the others, obtained with the thin bar, in 

 plotting the calibration line, Figure 7, for copper-steel junctions. 



lloo 



1800 



(^of Jter—^trman-Sififer 



Zd' ' ' 30' ' ' ' ' w' ' ' j'o- ' ' 6cr' ' iff 8<r 



»ic 



tJOo^JSer- pteet 



8ia 



I0-' ' ' ' za' " ' ' 3ir' ' ' ■ifl- ' so'' ' ' 'iff' ' ' 10' so* 



The electric currents were measured by means of a fairly sensitive 

 astatic galvanometer, the reduction factor of which was frequently 

 determined by use of a current of known strength. 



Copper-Steel Junctions. 



