296 



TABLES 354-355. 



OPTICAL CONSTANTS OF METALS. 



TABLE 354. 



TABLE 355. Reflecting Power of Metals. (See page 298.) 



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, But Bur. Stds. 14,0. 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. 



Wave-length, fi, .15 .20 .30 .50 .75 i.oo 2.00 3.00 4.00 5.00 9.00 

 Tungsten, - - - .50 .52 .576 .900 . 9 43 -9^8 . 9 53 



.32 .42 .50 .64 .67 .689 .747 .792 .825 .848 .880 

 SMITHSONIAN TABLES. 



