282 Tables 313, 314. 



TABLE 313. — Variation ol Electrical Resistance ol Glass and Porcelain with Temperature. 



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



log /? = a + W + cP, 

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

 square centimeter in cross section.* 



♦ T. Gray, "Phil. Mag." 1880, and " Proc. Roy. Soc." 1882. 

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



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



Smithsonian Tables. 



