282 TABLES 313,314. 



TABLE 313. Variation of Electrical Resistance of Glass and Porcelain with Temperature. 



The following table gives the values of a, b, and c in the equation 



log R a -f bt + ct 2 , 



where R is the specific resistance expressed in ohms, that is, the resistance in ohms per centimeter of a rod on 

 square centimeter in cross section.* 



* T. Gray, "Phil. Mag." 1880, and " Proc. Roy. Soc." i88a. 

 TABLE 314. Temperature Resistance Coefficients of Glass, Porcelain and Quartz dr/dt. 



Somerville, Physical Review, 31, p. 261, 1910. 



SMITHSONIAN TABLES. 



