352 G, Hinrichs on Spectral Lines. 
$5. Chlorine spectrum. 
Line. WwW 
D ‘ Ww’ E 
a Sint: 5451 0 
8 5216 iF ; 5216 0 
4792 4793 -E1 
7 3 
where d—47. Range, from yellow to blue. 
§ 6. Bromine spectrum. 
ii W D é Ww’ 
oe 516 = 5166 +3 
8 4793 ft a 4791 +2 
y 4766 “4 . 4766 0 
3 4691 4691 
where d=25. Range, from green to blue. 
It will be noticed that the first interval is five times the last. 
§ 7. Iodine spectrum. — 
Line, Ww 
D i Ww’ E 
ae ’ 
5947 5949 —2 
H ? ; 610 47 q 
533 5383 +4 
2 5167 pote = nee 48 
t 4661 $4 y 4661 0 
7 4629 ins es 4629 0 
6 4446 931 29 4445 +1 
4215 4218 +2 
‘ where d=8. Range, from orange to indigo, 
Though the differences E are not quite so insignificant as in 
the preceding, they are yet within the errors of observation; 
and though the intervals seem to follow no law, yet they may 
be grouped as follows: 
21 63 4 23 29 
or 77 21 63 5 
or 11 3 9 8 times 7 
—,—_ 
or 1l 12 8 
very nearly o:3 5%; 
and 4+23=27 with 29 forms another group if an intermediate 
line at 28 should be observed. As it seems, 7 is divisible in 
“iets t of these intervals, 7.d=56 will be an interval of a higher 
er. 
§ 8. Witrogen spectrum, 
ii . D Fy Ww E 
ll eh 521 8 pete oy 
17 5762 827 5 5764 
where d=65. Range, from red to yellow. 
EN is fo oN Soe RNY a ren Cae OU See We eat ey Oa ee 
