INTENSITY EELATIONS IN THE SPECTRUM OF HELIUM. 
147 
Table III.—Intensities of Helium Lines. 
A. 
: 
Photo- 
gragh 
I. at 
cathode. 
Photo¬ 
graphic 
intensity. 
Photo¬ 
graph 
II. at 
1 mm. 
beyond. 
Photo¬ 
graphic 
intensity. 
Photo¬ 
graph 
III. at 
2 mm. 
beyond. 
Photo¬ 
graphic 
intensity. 
Photo¬ 
graph 
IV. at 
3 mm. 
beyond. 
Photo¬ 
graphic 
intensity. 
Photo¬ 
graph 
V. at 
4 mm. 
beyond. 
Photo¬ 
graphic 
intensity. 
Photo¬ 
graph 
VI. at 
5 mm. 
lieyond. 
Photo¬ 
graphic 
intensity. 
Photo¬ 
graph 
VII. at 
6 mm. 
iieyond. 
Photo¬ 
graphic 
intensity. 
Photo¬ 
graph 
VIII. at ; 
7 mm. 
beyond. 
Photo¬ 
graphic 
inten.sity. 
6678 
6-25 
20-6 
18-7 
13-1 
5-82 
3-48 
2-00 
5876 
14-8 
42-8 
49-3 
44-0 
24-1 
15-5 
9-77 
2-67 1 
5047 
1-99 
1-43 
_ 
_ 
_ 
_ i 
5015 
13-65 
39-0 
29-8 
14-5 
5-24 
3-67 
2-13 
_ j 
4922 
3-33 
8-69 
7-94 
5-07 
2-69 
1-67 
_ 1 
4713 
3-37 
11-4 
10-7 
6-195 
3-27 
1-73 
_ 
4686 
— 
1-20 
— 
_ 
_ 
_ 
_ 
4472 
26-55 
80-9 
75-7 
64-4 
39-4 
25-4 
14-5 
3-62 
4437 
— 
1-95 
— 
— 
_ 
_ 
_ 
4388 
3-11 
5-97 
6-18 
5-21 
3-69 
1-93 
1-46 
_ 
4144 
— 
2-10 
2-01 
— 
_ 
_ 
_ 
_ 1 
4121 
2 - 32 
2-32 
— 
— 
_ 
_ 
_ 
4026 
4-51 
12-7 
16-8 
14-6 
7-21 
4-14 
2-46 
3965 
2-78 
5-41 
5-41 
2-93 
_ 
_ 
_ 
_ 
3888 
17-99 
43-6 
38-8 
21-5 
11*2 
5-94 
4-16 
' 
— 
A 3965 is just seen on V. 
Table IV.—Intensities of Helium Bands. 
A. 
Photograph IV. 
Photographic 
intensity. 
Photograph V. 
Photographic 
intensity. 
Photograph VI. 
Photographic 
intensity. 
Photograph VII. 
’- 
Photographic 
intensity. 
4650 
2-58 
2-92 
2-44 
2-16 
4546 
just seen 
1-47 
1-38 
just seen 
4459 
1-49 
1-75 
— 
— 
4447 
1-44 
1-59 
_ 
_ 
4427 
2-13 
2-32 
1-66 
1-50 
441-1 
2-42 
2-67 
1-98 
1-85 
4399 
2-12 
2-34 
1-79 
1-46 
4336 
— 
1-48 
1-71 
1-38 
Diffuse Series and Cathode Distance *—In order to isolate the various phenomena 
ot intensity distribution presented by the spectrum of Helium at different distances 
* Hicks has proposed a new arrangement of Plelium series, regarding P series as being in fact F series. 
We have thought it more convenient, however, to retain the older terminology in our discussion throughout, 
as we deal only with experimental results. 
Y 2 
