180 TABLES 163-165. INDEX OF REFRACTION FOR GLASS. 



TABLE 163. - Glasses Made by Schott and Gen, Jena. 



The following constants are for glasses made by Schott and Gen, Jena : A, c D n t> n Q* are 

 the indices of refraction in air for A=o.7682/t, C =0.6563/4, 0=0.5893, F=o.486i, G'=o.434i. 

 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 164. -Jena Glasses. 



TABLE 165. Change o< Indices of Refraction for 1 In Units of the Fifth Decimal Place. 



SMITHSONIAN TABLES. 



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



