Table 1 66. 

 INDEX OF REFRACTION. 



Indices ol Retraction for tbe vailons AInms.* 



I8I 



Index of refraction for the Fraunhofer lines. 



Aluminium Alums. /?Al(S04)24-'2H20.t 



Na 

 NH3(CHs) 

 K 

 Rb 

 Cs 

 NH4 

 Tl 



1.667 

 1.568 



1-735 

 1.852 

 1. 96 1 

 1. 63 1 

 2.329 



17-2S 



7-17 



14-15 



7-21 



15-25 

 15-20 

 10-23 



[.43492 



•45013 

 .45226 



•45232 

 •45437 

 •45509 

 .49226 



^•43563 

 .45062 



•45303 

 •45328 

 •455'7 

 •45599 

 •49317 



'•43653 

 •45177 

 •4539S 

 •45417 

 .45618 



•45693 

 •49443 



45410 



45645 

 45660 



45856 

 45939 

 49748 



[.44185 

 .45691 

 •45934 

 ■45955 

 .46141 

 .46234 

 .50128 



[.44231 

 •45749 

 •45996 

 •45999 

 .46203 

 .46288 

 .50209 



[.44412 



•45941 

 .46[8i 

 .46192 

 .46386 

 .46481 

 •50463 



1.44804 



•46363 

 .46609 

 .46618 

 .46821 

 .46923 

 .51076 



Indium Alums. .ffIn{S04)2+i2H20.t 



Rb 

 Cs 

 NH4 



2.065 

 2.241 

 2.011 



3-13 



17-22 



I7-2[ 



1.45942 



.46091 



.46193 



1.46024 

 .46170 



.46259 



1. 46 1 26 



.46283 

 •46352 



1. 4638 1 



.46522 



.46636 



1.46694 



.46842 

 •46953 



1. 467 5 1 



•46897 

 .47015 



1.46955 

 .47105 

 •47234 



1.47402 

 .47562 

 •47750 



Gallium Alums. i?Ga(S04)j+i2H20.t 



Cs 



K 



Rb 



NH4 



Tl 



2.113 



1.895 

 1.962 

 1-777 

 2-477 



17-22 

 19-25 



13-15 

 15-21 

 18-20 



1.46047 

 .46118 

 .46(52 

 .46390 

 .50112 



1.46146 

 .46195 

 .46238 

 .46485 

 .50228 



1.46243 

 .46296 

 •46332 

 •46575 

 •50349 



1.46495 

 .46528 



-46579 

 .46835 

 .50665 



r. 4678 5 

 .46842 

 .46890 

 -47146 

 -51057 



1.46841 

 .46904 

 .46930 

 .47204 



1.47034 



-47093 

 .47126 

 .47412 

 •51387 



1. 4748 1 

 •47548 

 -47581 

 .47864 

 .52007 



Chrome Alums. ifCr(S04)2+i2H20.t 



Cs 



K 



Rb 



NH4 



Tl 



2.043 

 1.817 

 1.946 

 1.719 

 2.386 



6-12 

 6-17 

 12-17 

 7-18 

 9-25 



1.47627 

 ■47642 

 .47660 

 .47911 

 .51692 



1-47732 

 •47738 

 -47756 

 .48014 

 .51798 



1.47836 

 -47865 

 .47868 

 .48125 

 •51923 



1. 48 1 00 



•48137 

 .48151 

 .48418 

 .52280 



1.48434 

 .48459 

 .48486 



-48744 

 .52704 



-48513 

 .48522 



•48794 

 .52787 



1.48723 

 -48753 

 •48775 

 .49040 

 .53082 



1.49280 

 •49309 

 •49323 

 .49594 

 •53808 



Iron Alums. /?Fe(S04)2-f izH.O.t 



K 



Rb 



Cs 



NH4 



Tl 



1.806 

 1.916 

 2.061 



2.385 



7-1 r 

 7-20 



20-24 

 7-20 



15-17 



1.47639 



•47700 

 .47825 

 .47927 

 -51674 



1.47706 

 -47770 

 .47921 

 .48029 

 -51790 



1-47837 

 •47894 

 .48042 

 .48150 

 •51943 



1. 48 1 69 



.48234 

 ■48378 



•52365 



1.48580 

 .48654 

 .48797 

 .48921 

 .52859 



1.48670 

 .48712 

 .48867 

 .48993 

 .52946 



1.48939 

 -49003 

 .49136 

 .49286 

 .53284 



1.49605 

 .49700 

 -49838 

 .49980 

 .54112 



* According to the experiments of Soret (Arch. d. .Sc. Phys. Nat. Geneve, 1884, 1888, and Comptes Rendus, 1885). 

 t /? stands for the different bases given in the first column. 



Smithsonian Tables. 



