184 TABLES 183-185. INDEX OF REFRACTION FOR GLASS. 



TABLE 183. Glasses Made by Schott and Gen, Jena. 



The following constants are for glasses made by Schott and Gen, Jena : A , c D> F, G are 

 the indices of refraction in air for ^=0.7682^, C =0.6563^1, 0=0.5893, F=o.486i, G' =0.4341. 

 v=(nv I)/(F c). Ultra-violet indices: Simon, Wied. Ann. 53, 1894. Infra-red: Rubens, 

 Wied. Ann. 45, 1892. Table is revised from Landolt, Bornstein and Meyerhoffer, Kayser, Hand- 

 buch der Spectroscopie, and Schott and Gen's list No. 751, 1909. See also Hovestadt's "Jena 

 Glass." 



TABLE 184. Jena Glasses. 



TABLE 185. Change of Indices of Refraction for 1 in Units of the Fifth Decimal Place. 



SMITHSONIAN TABLES. 



Pulfrich, Wied. Ann. 45, p. 609, 1892. 



