322 



Tables 321 -323 



TABLE 321. — Spectrum Emissivity of Tungsten (Percentage) 



Weniger and Pfund (P hys. Rev., 14, 427, 1919) verified Drude's formula for tungsten, 

 100 — R\ = e\ = 3650 Vp/X, valid for X > 2/x, where R\ = reflectivity, X, the wave length 

 in n, P, the specific resistance at the temperature considered. The following u.v. data is from 

 Hulburt (Astrophys. Journ. 45, 149, 1917, via Forsythe, Christison, Gen. Electr. Rev., p. 

 622, 1929), from which the data for 0.2 to 4.2^, 2800 are taken. 



TABLE 322. — Temperature Scale for Tungsten 



Hyde, Cady, Forsythe, Journ. Franklin Inst. 181, 418, 1916. See also Phys. Rev. 10,395, 

 191 7. The color temperature = temperature of black body at which its color matches 

 the given radiation. 



TABLE 323. — Radiation Characteristics of Tungsten 



(Forsythe, Worthing, Astrophys. Journ., 61, 146, 192s.) 



Smithsonian Tables 



