COAL-TAR AND WATER-GAS TAR CREOSOTES. 
107 
Table 40. — Indices of refraction at 60° C. of fractions of coal-tar creosotes. 
Horizontal-Retort Tar Creosotes. 
Fraction limits. 
Tar 
.No. 
235 to 
245 to 
255 to 
265 to 
275 to 
285 to 
295 to 
305 to 
315 to 
245° C. 
255° C. 
265° C. 
275° C. 
285° C. 
295° C. 
305° C. 
315° C. 
330° C. 
No. 
No. 
No. 
No. 
No. 
No. 
No. 
No. 
1 
1.5944 
1.5963 
1.5980 
1.6020 
1.6070 
1. 6142 
1.6213 
1.6283 
N. L.i 
2 
1.5892 
1.5933 
1.5964 
1.5995 
1.6048 
1.6108 
1.6173 
1.6250 
X.L. 
3 
1.5935 
1. 5937 
1.5953 
1.5978 
1.6027 
1.6085 
1. 6155 | 
1.6228 
X. L. 
4 
1.5965 
1.5923 
1. 5938 
1.5969 
1.6012 
1.6080 
1.6150 
1.6223 
X. L. 
5 
1. 5923 
1.5924 
1.5945 
1.5988 
1.6035 
1.6092 
1.6190 ! 
1.6263 
X.L. 
6 
1.5895 
1.5919 
1. 5946 
1.5975 
1.6022 
1.6093 
1.6157 
1.6237 
X.L. 
7 
1.5930 
1. 5936 
1.5948 
1.5979 
1.6028 
1.6090 
1.6163 
1.6230 
X.L. 
8 
1.5950 
1.5952 
1.5958 
1.5985 
1.6041 
1.6118 
1.6195 
1. 6269 
X. L. 
9 
10 
1.5931 
1. 5945 
1.5960 
1. 5995 
1.6050 
1. 6108 
1.6178 
1.6258 
X.L. 
11 
1.5971 
1.5873 
i.59S4 
1.6003 
1.6050 
1.6122 
1.6182 
1.6257 
X.L. 
12 
1.5813 
1.5892 
1. 5913 
1.5940 
1.5983 
1.6087 
1.6108 
1.6166 
X.L. 
13 
1.5882 
1.5898 
1.5907 
1.5940 
1.5985 
1.6048 
1.6120 
X.L. 
14 
1.5920 
1.5930 
1.5942 
1.5965 
1.6010 
1.6060 
1.6140 
1.6205 
X.L. 
15 
1.5869 
1.5900 
1.5918 
1. 5947 
1.5997 
1.6046 
1.6118 
1.6197 
X.L. 
16 
1.5915 
1.5923 
1.5932 
1.5963 
1. 6013 
1.6075 
1.6100 
X. L. 
X.L. 
Inclined-Retort Tar Creosotes. 
17 
1.5792 
1.5795 
1.5802 
1.5822 
1. 5862 
1.5922 
1.5988 
1.6052 
X.L. 
18 
1.5843 
1. 5821 
1.5816 
1.5836 
1.5875 
1.5943 
1.6010 
1.6078 
X.L. 
19 
1.5800 
1. 5824 
1.5840 
1.5868 
1.5919 
1.5980 
1.6040 
1.6113 
X.L. 
20 
1.5830 
1.5852 
1. 5868 
1.5892 
1.5925 
1. 5993 
1.6023 
1.60S3 
X.L. 
21 
1.5745 
1.5758 
1.5773 
1.5796 
1.5890 
1.5888 
1.5942 
1.5988 
X.L. 
22 
1 5925 
1.5926 
1. 5931 
1.5963 
1.6003 
1.6078 
1.6147 
1.6230 
X.L. 
Vertical-Retort Tar Creosotes. 
1.5716 
1.5776 
1.5810 1.5843 1.5904 
1. 5971 
1.6047 ! X.L. 
Otto Tar Creosotes. 
24 
1.6021 
1.602S 
1.6041 
1.6071 
1. 6132 
1.6208 
1.6273 
X.L. 
X.L. 
25 
1.5936 
1. 5949 
1.5970 
1.5994 
1.6032 
1.6100 
1.6165 
1.6245 
X.L. 
26 
1.5998 
1.6003 
1.6018 
1.6042 
1.6105 
1.6160 
1.6229 
X.L. 
X.L. 
27 
1.6004 
1.6015 
1. 6021 
1.6051 
1.6098 
1.6160 
1.6230 
X.L. 
X.L. 
28 
Semet-Solvay Tar Creosotes. 
29 
1.5915 
1.592S 
1.5937 
1. 5968 
1.6011 
1.6073 
1.6122 
1.6192 
X.L. 
30 
1. 5918 
1.5933 
1.5950 
1.5983 
1.6031 
1.6098 
1.6170 
1.6243 
X.L. 
31 
1.5979 
1.5983 
1.5993 
1.6532 
1.6090 
1.6170 
1.6232 
X.L. 
X.L. 
32 
1.5996 
1.6000 
1.6018 
1.6046 
1.6103 
1.6170 
1.6240 
X.L. 
X.L. 
33 
34 
1.5880 
1.5878 
1.5883 
1.5901 
1.5941 
1.6012 
1.6080 
1.6183 
X.L. 
Koppers Tar Creosotes. 
1.6031 1.6050 I 1.6071 
1.6122 
1.6182 1.6251 
1.6322 
X.L. 
X.L. 
Xot liquid at 60° C 
