ON THE MEASUREMENTS OF WAVE-LENGTHS. 
95 
Scale- 
numbers. 
17-46 
54- 72 
55- 03 
57- 90 
58- 58 
59- 30 
59- 83 
60- 07 
65-45 
109- 52 
110- 04 
110-36 
135- 67 
136- 33 
140-55 
142-30 
142- 85 
143- 18 
145-85 
150-09 
167- 74 
168- 70 
170-18 
172-58 
178-25 
184- 63 
185- 23 
185-61 
191- 72 
192- 80 
194- 55 
195- 39 
195- 95 
196- 92 
198-64 
198- 96 
199- 30 
199-61 
199-97 
208-48 
208-80 
226-42 
The Spectrum of Magnesium. 
{ 
{ 
Description of lines. 
Wave¬ 
lengths. 
Remarks. 
Very strong, discontinuous, broad, with 
nimbus. 
Weak, short. 
Weak, short. 
Weak, short. 
Weak, short. 
Strong, continuous, extended . . . 
Strong, continuous, extended . . . 
Strong, continuous, extended . . . 
Faint, short, broad, nebulous . . . 
Weak, fine, continuous, extended, faint 
in centre. 
Weak, fine, continuous. 
Weak, fine, continuous. 
Faint, short. 
Faint, short. 
Weak, short, broad, nebulous 
Strong, continuous, fine, extended . . 
Fairly strong, continuous, fine, extended 
Fairly strong, continuous, fine, weak in 
centre. 
Weak, short, fine........ 
Faint, short, fine. 
Faint, very fine, discontinuous . . . 
Very strong, continuous, broad, with 
nimbus extended. 
Very strong, continuous, broad, with 
nimbus extended. 
Strong, fine, short. 
Faint, short, broad, nebulous . 
Very strong, continuous, broad, with 
nimbus, extended. 
Very faint, fine, continuous . . 
.Very faint, fine, continuous . . 
Faint, discontinuous, nebulous . 
Faint, discontinuous, nebulous . 
4480-1 
3896 0 
3892-0 
3855-5 
3849-5 
3837-9 
3832-1 
3829-2 
3765-3 
3336-3 
3331-8 
3329-1 
3139-3 
3134-3 
31070 
3096-2 
3091-9 
3089-9 
3071-6 
3046-0 
2941-6 
2935-8 
2928-1 
2913-8 
2884-3 
2851-2 
2847-9 
2845-9 
2815-3 
28100 
Very strong, continuous, fine, extended 
Very strong, continuous, fine, extended 
Very strong, continuous, fine, extended 
Very strong, continuous, fine, extended 
2801-6 
2796-9 
2794-1 
2789-6 
All the strongest lines of magnesium 
are much extended and sur¬ 
rounded by a very strong nimbus. 
A nebulous air-line occurs at 
X=3856-l. 
very strong nimbus is seen 
around these lines. 
|>A large nimbus is seen here. 
The first and third lines of this 
quadruple group are more per¬ 
sistent than the second and 
fourth, so that the former lines 
k. ' 
are visible in solutions too 
dilute to show the latter. The 
nimbus to this group of lines is 
J remarkably strong. 
'Fairly strong, continuous, fine 
Fairly strong, continuous, fine, weak in 
centre. 
- Strong, continuous, fine. 
Fairly strong, continuous, fine, weak in 
centre. 
^Fairly strong, continuous, fine . . 
f Faint, fine, discontinuous. 
\ Faint, fine, discontinuous. 
Short, weak, broad, nebulous . . . 
2781-8 
2780-2 
2778-7 
A nimbus surrounds the extremi¬ 
ties of these lines. 
2776-9 
2775-5 
2736 0 
2734-3 
2658-4 
