TABLES 186-188. INDEX OF REFRACTION, 

 TABLE 186. -Index oi Refraction of Rock Salt In Air. 



where ^=2.33016$ 

 MI =0.01 278685 

 Ax 2 =0.0 1 48 500 

 ^2=0.005343924 



\ 2 2 =o.o25474i4 

 / =0.0009285837 

 ^=0.000000286086 



32=5.680137 

 ^73=12059.95 

 A 3 ' 2 =36oo. (P) 



TABLE 187.- Change of Index of Refraction for 1 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 188. Index of Refraction of Silvine (Potassium Chloride) in Air. 



^2=2.174967 A 2 2 =o.o25555o f> 2 = 3.866619 



MI= 0.008344206 =0.000513495 ^3=5569.715 



Ai 2 =o.oi 19082 h =0.000000 1 67 587 Aa 2 =3292.47 (P) 



M 2 = 0.00698 382 

 W Weller, see Paschen's article. Other references as under Table 187, above. 



SMITHSONIAN TABLES. 



