TABLES 168-170. INDEX OF REFRACTION, 

 TABLE 188. -Index of Refraction of Rock Salt in Air. 



where a z = 2.330165 

 MI =0.0127868 5 

 Ax 2 =0.0 1 48 500 

 ^2=0.005343924 



A 2 a = 0.02 54741 4 

 =0.00092858 

 >&= 0.00000028 



2=5.680137 

 M s = 12059.95 

 A 3 2 =36oo. ' 



(P) 



TABLE 169. Change of Index of Refraction for 1 C in Units of the 5th Decimal Place. 



L Annals of the Astrophysical Observatory 

 of the Smithsonian Institution, Vol. I, 1900. 

 M Martens, Ann. d. Phys. 6, 1901, 8, 1902. 

 Mi Micheli, Ann. d. Phys. 7, 1902. 



P Paschen, Wied. Ann. 26, 1908. 

 PI Pulfrich, Wied. Ann. 45, 1892. 

 RN Rubens and Nichols, Wied. Ann, 60, 1897. 



TABLE 170.- Index of Refraction of Silvine (Potassium Chloride) in Air. 



2 =" 2 + ^i+^*-**-'<* or =* 2 + re 



a 2 =2. 174967 

 M l ^= 0.008344206 

 Ai 2 =o.oi 19082 

 ^2=0.00698382 



W Weller, see Paschen's article. Other references as under Table 169, above. 

 SMITHSONIAN TABLES. 



=0.000513495 

 h =0.000000 1 67 587 



2=3.866619 

 ^3=5569.715 

 A 3 2 =3292.47 (P) 



