294 M. Frauenhofer on the Refractive and Dispersive Power 
Refracting 
Media. 
Temp. 
Reaumur. 
Specific 
Gravity. 
Angle of 
the 
Prism. 
Angle of 
Devia- 
tion, or 
of N. 
See Plate VII. Fig. 4. 
ON 
NM 
NL 
NK 
NI 
Crown gl. No. 9. 
3 
2.53S 
39° 20 35 
22°38 / 20 
6 1 
5 46 
11 22 
1656 
22 16 
Flint gl. No. 13, 
n 
3.723 
26 24 30 
17 27 9 
7 17 
7 15 
14 18 
21 31 
28 46 
Water, 
8 
1.000 
58 5 40 
22 36 41 
6 35 
6 19 
12 9 
17 45 
23 18 
Water, 
H 
1,000 
58 5 40 
22 36 43 
6 30 
6 12 
12 5 
17 43 
23 10 
Sulphuric Acid, 
n 
1.841 
58 5 40 
29 27 47 
7 50 
7 15 
14 3 
20-30 
26 45 
Alcohol, 
9 
0.809 
58 5 40 
25 8 32 
6 35 
6 17 
12 55 
18 45 
Vitriolic Ether, 
9 
58 5 40 
24 38 39 
6 20 
6 27 
12 55 
19 10 
Sulphuric Ether, 
9 
58 5 40 
24 38 39 
6 20 
6 27 
12 55 
19 10 
Oil ofTurpentine, 
7 
0.885 
58 5 40 
33 22 8 
11 00 
11 35 
22 45 
34 20 
Kali dissolved 1 
in water, j 
Si 
1.416 
58 5 40 
27 45 54 
8 32 
7 58 
15 35 
23 6 
30 24 
1 part Sugar of 1 
Lead, 3 parts > 
Water, j 
8| 
58 5 40 
24 34 49 
7 54 
7 31 
14 47 
21 40 
28 22 
Oil ofTurpentine, 
84 
0.885 
58 5 40 
33 20 8 
11 5 
11 32 
22 45 
33 56 
44 50 j 
In the following table I have given the indices of refraction 
for the different coloured rays in flint-glass, crown-glass, and 
water, which have been computed from the observed angles, 
calling O n the index of refraction for the ray O, and N n that 
for the ray N, &c. 
Refracting Media. 
i O n 
N n 
Mn 
L n 
K 71 
I n 
Flint-glass, No. 13. 
1.63074 
1.63505 
1.63933 
1.64349 
1.64775 
1.65203 
Crown-glass, No. 9. 
1.52736 
1.52959 
1.53173 
1.53380 
1.53586 
1.53783 
Water, 
1,33209 
1.33359 
1.33501 
1.33635 
1.33763 
1.33888 
From these data there results the ratio of the dispersion of the 
different coloured rays for these refracting media, as is shewn 
in the following table, where On', N n' 9 &c. are the indices of 
refraction from the substances that have the strongest disper- 
■ siom 
