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 hidices of refraction in air for A=o.76S2/u, €=0.6563/1, = 0.5893, F = o.486i, G' = o.434i. 

 v=(h^ — i)/(«F — «(;)• Ultra-violet indices: Simon, Wied. Ann. 53, 1S94. Infra-red: Rubens, 

 Wied. Ann. 45, 1S92. 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 184. — Jena Glasses. 



No. and Type of Jena Glass. 



O 225 Light phosphate crown 

 O 802 Boro-silicate crown . 

 UV3199 Ultra-violet crown 

 O227 Barium-silicate crown 

 O 1 14 Soft-silicate crown . 

 O 608 High-dispersion crown 

 UV3248 Ultra-violet flint . 

 O3S1 High-dispersion crown 

 O602 Baryt light flint . . 

 S 389 Borate flint . . . 

 O 726 Extra light flint . 

 O 154 Ordinary light flint 

 O 184 " " " 



O 748 Baryt flint . . . 

 O 102 Heavy flint . . 

 O41 " "... 



Oi6s " "... 

 S 386 Heavy flint . . . 

 S 57 Heaviest flint . . 



«,, for D 



1.5159 

 1.4967 

 '•5035 

 "•5399 

 •-5'5i 

 1.5149 

 ■-5332 

 1.5262 

 1.5676 

 1.56S6 

 1-5398 

 1.57x0 

 1.5900 

 1-6235 

 1 .6489 

 1.7174 

 1.7541 

 1. 9170 

 1.9626 



•00737 

 0765 

 0781 

 0909 

 0910 

 0943 

 0964 

 1026 

 1072 

 1 102 

 1142 

 1327 

 1438 

 >599 

 1919 

 2434 

 2743 

 4289 



70.0 

 64.9 

 64.4 



59-4 

 56.6 

 54.6 

 55-4 

 5'-3 

 53-0 

 51-6 

 47-3 

 43-0 

 41.1 

 39-1 

 33-8 

 29-5 

 27.5 

 21.4 

 "9-7 



.00485 

 0504 

 0514 

 0582 

 0577 

 0595 

 06 II 

 0644 

 0675 

 0712 

 071 1 

 0819 

 0882 

 9965 

 1152 

 1439 

 1607 

 2451 

 2767 



.00515 

 0534 

 0546 

 0639 

 0642 

 0666 

 0680 

 0727 

 0759 

 077s 

 0810 

 0943 

 1022 

 1 1 42 

 1372 

 1749 

 '974 

 3109 

 3547 



.00407 

 0423 

 0432 

 0514 

 0521 

 0543 

 0553 

 0596 

 0618 

 0629 

 0669 

 0791 

 0861 

 0965 

 1180 

 1521 

 1730 

 2S08 

 3252 



Specific 

 Weight. 



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, 1S92. 



