OBTAINED AT THE TOTAL SOLAR ECLIPSES OF 1900, 1901 AND 1905. 441 
intensity 10, 9, 8 and 7 are generally well shown, except at the red end of the 
spectrum. The strongest lines in the chromosphere are “ enhanced,” e.g., 4012-54, 
3757‘82, 4172-07. The lines 3753"00, 3924"67, 3948"82, 3956*48 may be instanced as 
lines strong in the arc and the sun, but missing in the chromosphere. 
The behaviour of the titanium lines may be instanced from almost any part of the 
spectrum. A good variety of lines is shown between 3900 and 3950. 
Wavedength. 
Chromosphere. 
Spark. 
Arc. 
Sun. 
3900-68 
7 
50 
2-3 
5 
3904-93 
— 
10 
3-4 
3 
3913-61 
7 
30 
2-3 
5 
3924-67 
— 
7 
2-3 
4 
3932-16 
3 
6 
. 
1 
3947-92 
0 
9 
3-0 
2 
Vanadium. 
Vanadium is not at all strong in the chromosphere. The strongest arc lines, 4379 
and 4384, are not shown. There is, however, reason to think some of the “ enhanced ” 
lines are present, as will be seen from the following table :— 
Chromosphere. 
Solar spectrum. 
Spark* 
Arc* 
inten- 
inten- 
W ave- 
No. of 
Inten- 
Wave- 
Intensity. 
sity. 
sity. 
length. 
photos. 
sity. 
length. 
3517-51 
3 
1 
3517-45 
- V 3 
20 
4 
3520-21 
1 
0 
3520-17 
2 
14 
4 
3530-90 
4 
2 
3530-92 
3 
20 
4 
3545-27 
3 
1 
3545-34 
- V 4 
20 
4 
3566-21 
3 
1 
/ 3566 -11 
\ 3566-31 
Ti 1 \ 
- 2N J 
12 
3 
3592-16 
7 
3 
3592-17 
V? 2 
18 
4 
3700-41 
2 
1 
3700-48 
1 
12 
— 
3715-60 
8 
. 3 
3715-62 
Mn? 4 
20 
4 
3718-44 
2 
1 
— 
— 
10 
— 
Wave-length 3718-35 in spark. 
3727-46 
2 
1 
3727-49 
1 
16 
4 
3728-49 
2 
1 
— 
— 
10 
— 
„ 3728-51 „ 
3736-11 
3 
1 
— 
— 
10 
— 
„ 3736-16 „ 
3771-06 
1 
0 
3771-12 
2 
20 
4 
3787-34 
1 
1 
— 
— 
16 
2 
„ 3787-39 „ 
4023-55 
6 
2 
4023-53 
V-Co 3 
20 
4 
4090-78 
3 
2 
4090-73 
V? 1 
16 
6 
4095-58 
1 
0 
4095-63 
Y 0 
12 
6 
4116-66 
1 
1 
f4116-63 
14116-71 
Y 1 1 
V, Fe 1 0 / 
14 
U 
* From ‘Watts’ Index,’ Appendix M. 
It should at the same time be noted that a number of enhanced lines are not seen, 
but this may be expected when the lines which are shown are all weak. 
VOL. CCVI.- A. 3 L 
