THE DETERMINATION OF REFRACTIVE INDEX 
247 
Table V. 
COMPOUNDS BELONGING TO THE ISOMETRIC SYSTEM WHOSE 
CRYSTAI.S MAY BE USED FOR THE DETERMINATION 
OF THE REFRACTIVE INDICES OF LIQUIDS. 
Refractive 
index. * 
Name. 
Formula. 
1-439 
I -450 
1-459 
1.481 
1.48s 
1.490 
1.494 
1.502 
I-515 
I-544 
1-553 
1-559 
1.566 
1-571 
1.640 
1-645 
1.650 
1-657 
1.667 
Sodium alum. 
Potassium alum. 
Ammonium alum. 
Potassium chromium alum. 
Ammonium iron alum. 
Potassium chloride. 
Rubidium chloride. 
Sodium uranyl acetate. . . . 
Sodium chlorate. 
Sodium chloride. 
Rubidium bromide. 
Potassium bromide. 
Strontium nitrate.. . 
Barium nitrate. 
Ammonium chloride. 
Cesium chloride. 
Rubidium iodide. 
Potassium chlorostannate.. 
Potassium iodide. 
Na 2 S 04 -Al 2 (S 04 ) 3-24 H20 
K 2 S 04 -A 12 (804)3-24 H2O 
(NH4)2S04-Al2 (804)3-24 H2O 
K2S04-Cr2 (804)3-24 H2O 
(NH4)2 S04-Fe2 (804)3- 24 H2O 
KCl 
RbCl 
NaC2H302-U02 (C2H302)2 
NaC103 
NaCl 
RbBr 
KBr 
Sr (N 03)2 
Ba (NOs)^ 
NH 4 CI 
CsCl 
Rbl 
K2SnCl6 
KI 
1.698 
1.700 
1-755 
1.788 
I-95 + ? 
2.071 
Cesium bromide.. 
Ammonium iodide, 
Arsenic trioxide. . , 
Cesium iodide. 
Lead nitrate. 
Silver chloride. 
CsBr. 
NH4I 
AS2O3 
Csl. 
Pb (N 03 ) 2 . 
AgCl 
n lies between 
1.69 and 1.71 
Bolland gives 
Csl n = 1.9s 
Groth gives 1.782 
1 Most of these values for n are taken from Groth’s tables. Chemische Krystallographie, 
Leipzig, 1906-10. 
