l30 Tables 163-165. INDEX OF REFRACTION FOR GLASS. 



TABLE 163. — Glasses Hade by Schott and Gen, Jena. 



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

 the indices of refraction in air for A=o.76S2/i, C = o.6563/u, = 0.5893, F = o.486i, G'=o.434i. 

 z/=(«]) — 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 Spectroscopic, and Schott and Gen's list No. 751, 1909. See also Hovestadt's "Jena 

 Glass." 



TABLE 164. — Jena Glasses. 



No. and Type of Jena Glass. 



«,, for D 



Specific 

 Weight. 



O 225 Light phosphate crown 

 O 802 Boro-silicate crown . 

 UV3199 Ultra-violet crown 

 O227 Barium-silicate crown 

 O 1 14 Soft-silicate crown . 

 O608 High-dispersion crown 

 UV3248 Ultra-violet flint . 

 O381 High-dispersion crown 

 O 602 Baryt light flint . . 

 S 389 Borate flint . . . 

 O 726 Extra light flint . 

 O 154 Ordinary light flint 

 O184 " " " 



O 748 Baryt flint . . . 

 O 102 Heavy flint . . 

 O41 " "... 

 O165 " "... 

 S 386 Heavy flint . . . 

 S 57 Heaviest flint . . 



i-5'59 

 1.4967 



I -5035 

 1-5399 

 i-5'5' 

 i-5'49 

 1-5332 

 1.5262 

 1.5676 

 1.5686 

 1-5398 

 1.5710 

 1.5900 



1-6235 

 1 .6489 

 1.7174 

 t.7541 

 1.9170 

 1.9626 



-00737 

 0765 

 0781 

 0909 

 0910 

 0943 

 0964 

 1026 

 1072 

 1 102 

 1142 

 1327 

 1438 

 1599 

 1919 

 2434 

 2743 

 4289 



70.0 

 64.9 

 64.4 



59-4 

 56.6 

 54.6 

 55-4 

 5'-3 

 530 

 51.6 

 47-3 

 43 o 

 41.1 

 39-1 

 33-8 

 29-5 



27-5 



21.4 



19.7 



.00485 

 0504 

 0514 

 0582 

 0577 



0595 

 061 1 

 0644 

 0675 

 0712 

 0711 

 0819 

 0882 

 9965 

 1152 



1439 

 1607 



245' 

 2767 



.00515 

 0534 

 0546 

 0639 

 0642 

 0666 

 0680 

 0727 

 0759 

 077s 

 0810 

 0943 

 1022 

 1142 

 1372 

 1749 

 1974 

 3'09 

 3547 



.00407 

 0423 

 0432 

 0514 

 0521 

 0543 

 0553 

 0596 

 0618 

 0629 

 0669 

 0791 

 0861 

 0965 

 1180 

 1521 

 1730 

 2808 

 3252 



2.58 

 2.38 

 2.41 

 2-73 

 2-55 

 2.60 



2-75 

 2.70 

 3.12 

 2.83 

 2.87 

 3.16 

 3.28 

 3-67 

 3-87 

 4-49 

 4.78 

 6.01 

 6.33 



Smithsonian Tables. 



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



