78 
Proceedings of the Poyal Society of Edinburgh. [Sess. 
different wave-lengths overlapping had different rotations, and hence 
different relative intensities for their components. 
In the following table the examples of symmetry found in tungsten are 
Table I.— Tungsten. 
Field strength = 24, 650 gauss. 
Wave- 
length. 
Dissym. 
2488*89 
n 
2522*14 
n 
2555*23 
n 
2580*63 
n 
2606*50 
a 
2633*24 
n 
2697*81 
n 
2774*12 
n 
2774*60 
n 
2792*85 
n 
. CO _ 
sag 
si g . 
>> 
-1-3 
<£ 1 , h=s' 
+ <D 
CO 
G 
§ . -P3 
-4-3 
H QjO 
—i r— H 
-4-3 H O 
.2 5^ 
g 
hH 
Remarks. 
Wave- 
length. 
Dissym. 
Distance from mid. 
Compt. ( - towards 
Violet, + towards 
Red). 
2856*20 
n 
i -0*151 
i 0 
[ +0T37 
3049*80 
n 
f r -0*289u 
0 
^ L + 0*252 J 
3311*53 
a 
f -0*159 
\ 0 
l +0*181 
3361*25 
a 
f -0*124 
1 ° 
{ +0*139 
3373*88 
a 
00 
00 
o p 
o o © 
1 + 
[ ] Less accurate. 
3413*09 
a 
f -0*084 
1 0 
t +0*108 
3429*75 
a 
f -0*069 
\ o 
( +0*084 
3448*96 
a 
+ i 
o © o 
© © 
oo -4 
OO -4 
4298*55 
n 
f -0*535 
| -0*128 
| +0*126 
l +0*454 
Min. intensity 
of mid. compt. 
A = 2850 approx. 
-0*147 
0 
+ 0*116 
-0*146 
0 
+ 0*117 
-0*152 
0 
+ 0*114 
-0*128 
0 
+ 0*101 
-0*149 
0 
+ 0*155 
r - 0*135- 
0 
_ + 0*10lJ 
-0*169 
0 
+ 0*150 
-0*177 
0 
+ 0*133 
-0*153 
0 
+ 0*136 
r - 
I 
0*172 
0*083 
0 
+ 0*083 
l +0*159 
• pH 
CO 
a 
<D 
Remarks. 
* Shaded to- 
wards violet. 
Mid. compt. 
twice as strong 
A = 8450 approx. 
given. The measurements are stated in millimetres, it being unnecessary 
for the purpose here to change these to variations in the vibration fre- 
quencies. With the apparatus used, the error in measurement will very 
