250 



TABLES 279-281. 

 RADIATION EMISSIVITIES. 



TABLE 279. Relative Emissivities of Metals and Oxides. 

 Emissivity of black body taken as 100. 



TABLE 280. Temperature Scale for Tungsten. 



Hyde, Cady, Forsythe, J. Franklin Inst. 181, 418, 1916. See also Phys. Rev. 10, 395, 1917. The color temperature 

 temperature of black body at which its color matches the given radiation. 



TABLE 281. Color minus Brightness Temperatures for Carbon. 



Hyde, Cady, Forsythe, Phys. Rev. 10, 395, 1917. 



SMITHSONIAN TABLES. 



