378 Tables 422 and 423 



TABLE 422. — Optical Constants of Metals (Additional Data) 



Metal. 



Al* 

 Sb* 

 Bi.tt 

 Cd* 

 Cr.* 

 Cb* 

 Au.t 



I. crys. 



Ir* 



Fe.§ 



Pb* 

 Mg* 

 Mn.* 

 Hg. (liq.) 



Fd* 

 Pt.t 



Ni* 



589 

 hite 

 589 

 579 

 579 

 257 

 441 

 589 

 589 

 579 

 257 

 441 



589 

 589 

 589 



579 

 326 

 441 

 589 

 668 



579 

 257 

 441 



589 

 668 

 275 

 441 

 589 



R. 



83 



70 



85 

 70 



41 

 28 

 42 

 82 

 3° 

 75 

 16 

 28 



33 

 62 



93 

 64 

 66 

 74 

 75 

 77 

 6S 

 37 

 58 

 59 

 59 

 24 

 25 

 43 



Ref. 



Rh* 

 Se.l 



Si* 



Na. (liq.) 



Ta.* 



Sn* 



W.* 



V.* 



Zn* 



0-579 

 400 

 490 



589 

 760 



589 



25 



25 



589 



579 



589 



579 



579 



257 



44i 



589 



668 



i-54 

 2.94 



3-12 



2-93 

 2.60 

 4.18 

 3-67 

 3-53 

 .004 

 2.05 

 1.48 

 2.76 

 3-03 

 °-55 

 o-93. 

 i-93 

 2.62 



4.67 

 2.31 

 1.49 



o-45 

 0.06 

 0.09 

 0.08 

 0.08 

 2.61 

 2.31 



5-25 

 2.71 



3-5' 

 0.61 



3- l 9 

 4.66 



5.08 



78 

 44 

 35 

 25 

 20 



38 

 33 

 3i 

 99 

 44 

 82 



49 

 58 

 20 



73 

 74 



73 



Ref. 



\=z wave-length, n = refraction index. 



k = absorption index, R = reflection. 



(1) Drude, see Table 421 ; (2) Kundt, prism 

 used, Ann. der Physik und Chemie, 34, p. 477, 

 36, p. S24, 18S9; (3) v. Wartenberg, Verh. 

 deutsch. Physik. Ges. 12, p. 105, 1910; (4) 

 Meier, Annales der Physik, 10, p. 581, 1903; 

 (5) Wood, Phil. Mag. (6), 3, 607, 1902 ; (6) 

 Ingersoll, see Table 421. 



* solid, t electrolytic, 1 prism, § deposited 

 as film in vacuo. 



TABLE 423. — Reflecting Power of Metals (See page 379) 



Coblentz, Bulletin Bureau of Standards, 2, p. 457, 1906, 7, p. 197, 1911. The surfaces of some of the 

 samples were not perfect so that the corresponding values have less weight. The methods for polishing 

 the various' metals are described in the original articles. The following more recent values are given 

 by Coblentz and Emerson, Bui. Bur. Stds. 14, p. 207, 1917; Stellite, an exceedingly hard and untarnish- 

 able alloy of Co, Cr, Mo, Mn, and Fe (C, Si, S, P) was obtained from the Haynes Stellite Co, Kokomo, 

 Indiana. 



.8S0 



