Cag a ee ee ee ee ee eee aa rT ae OPES 
G. Hinrichs on Spectral Lines. 361 
Grove III. i= oe oe 
I 
Ww’ E 
5e ve res 5 go S086 100 
6d 20052 4918-8 9 4918764 +036 
6c 20072 49173 5, 4917346 —-046 
6c 2041°3 4890-4 1 4890-404 —-004 
65 2042-2 48898 = 4g = 4889695 105 
6e 2058°0 = A876-4 g 4876224 +176 
5e 2066-2 4870-0 1 4869943 4-057 
5e 20671 48692 4, 4869:234 —-034 
4857'890 —-190 
‘Bae as bea as nothing. The intervals arrange themselves as fol- 
ow 
2 38 1 19 9 1 16 
—_—— : —— —— 
40 20 10 16 
Cee Brees 
Of course, the extremities not necessarily re sara full 
intervals, need not correspond; yet they are sibel by 4. 
The natural intervals of a higher order in this group are: 
=4d,=2836, D,”=5d,=3545, D,’”"=10d, = 090, and per- 
haps D,"=9d,=6'881. 
Comparing the different groups we see that the differences d 
are not te same, for 
- 
d,==0°9, d,==0°709, 
but we Hees foie the intervals D * 
yellow, D,’ = 44,==-13 = { 
green, D, ==15¢d,=13'5 >} mean 13°61, 
blue, 2 2D. go ead 18 
Which are not quite equal, but good approximations. We shall 
come back to this difference between the values—it seems that 
the values are a little larger in the blue than in the 
a psi king back upon ‘the complicated groups of the Tich iron 
m we cannot help being convinced that the dark lines are 
distribated according to law, at mudtiple intervals as measured 
by the wave-length. 
§ 25. Before concluding this part of our investigation we will 
dcinpars our new results with those in our first article. the 
‘ron spectrum, the first group shows the following intervals: 
then - 8 12 it 11 
now 2 4 5 4 1 1 
while the second groups gave 
mae 6 8.3 48 6.70: 6 6-2 6.5 8 M888 
mem 20:8 38 St 9 1 8-1 8S 10 ae 
and the third group 
then 
4 
me £ £ 38 1 1: eee 
