278 TABLES 327-329. INDEX OF REFRACTION FOR GLASS. 



TABLE 327. - Glasses Made by Schott and Gen, Jena. 



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

 the indices of refraction in air for A=o.76S2/i, 0=0.6563/1, D=o.5S93, F=o.486i, G / = 0.4341. 

 z/=( D 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 328. Jena Glasses. 



TABLE 329. Change ol Indices of Refraction for 1 C in Units of the Fifth Decimal Place. 



SMITHSONIAN TABLES. 



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



