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



TABLE 327. — Glasses Made by Schott and Qen, Jena. 



The following constants are for glasses made by Schott and Gen, Jena : «a. «c. «d. «p, «o. are 

 the indices of refraction in air for A=o.7682/t, €=0.6563^ D=o.5893, F = o.4S6i, G'=o.434i. 

 7;=(«D — i)/(«F — «l)- Ultra-violet indices: Simon, Wied. Ann. 53, 1894. Infra-red: Rubens, 

 Wied. Ann. 45, 1892. Table is revised from l>andolt, Bbrnslein and Meyerhoffer, Kayser, Hand- 

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

 Glass." 



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



Smithsonian Tables. 



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



