Allen — The Electrical Resistance of Porcelain. 303 



0'Q» 10 

 0-% , 



*= o-7 



a O'lo •• 



H 



to 

 H 



I 0-2f - 



TJ1 



0-3 



o-a 



0*1 



%0 Qo ioo no «lo 130 n*.o iso 



Temp. Deg. Cent. 



Fio. 6. — Resistance-Temperature Curves for samples A, B, C, D, E, F, and H. 



