Allen — The Electrical Resistance of Porcelain. 



301 



P3 



M 



k,k.00 

 lt.,000 



3(000 

 3,aoo 

 a,8oo 

 a,jfOo 

 a, 000 



l,(poo 



/,aoo 



800 



Voo 



ISO Ido /JO 180 IQO ZOO 110 220 230 



Temp. Deg. Cent. 



Fig, 4. — Kesistance-Temperature Curves for samples A, B, 0, D, E, and F. 



