332 Tables 405, 405A. 



TABLE 406. — Yariation of Electrical Resistance of Glass and Porcelain with Temperature. 



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



log /? = a + « + <:/«, 

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

 square centimeter in cross section.* 



* T. Gray, "Phil. Mag." x88o, and " Proc. Roy. Soc." 1882. 

 TABLE 405a, — Temperature Resistance Coefficients of Olass, Porcelain and Quartz dr/dt. 



Somerville, Physical Review, 31, p. 361, 1910. 



Smithsonian Tables. 



