and Electrical Resistance of Iron. 



253 



17. 



•2 60000 



^S 



cq' 



Resistance- Temperature Curves. 

 Iron specimen A. (Grit. temp. 795° C.) 



Curve I. Before annealing. Curve II. After annealing at 1050° C. 





j 





,-r'o 









• 



//^ 







// 



/ i 



■^ 



/ 





■ 





• 



o°c. 



200° 



400° 600° 



Temperature. 



800° 



1200° C. 



