156 
PROFESSOR A. S. HERSCHEL ON 
WAVE-LENGTHS of NirroGen LINELETS between the extreme Red and Yellow;(!) measured in a Cyanogen, and 
in a Deutoxide of Nitrogen End-on Vacuum Tube, with Prisms of the Aurora-Spectroscope giving a Dis- 
persion from A to H of 
92° « 
=- ;j 
compared with Measurements of the same Lines by ANGsTROM and THALKN. 
samba AK are made by numerals in the Table, to the brief list of Notes appended to it at the end.) 
= 
Wave- 
length ; 
tenth- 
metres. 
2(?)) 
1 | 75103 
| 
2 | 7398°3 | 
3 | 7275°6 
4 | 7162°3 
5 | 7065°3? 
6 | 6968-2 
[6870-0(4) 
731 6880°1 
| 6785°7 
8 6791°6 
6701-0 
9?| 6702°8 
6621°8 
102} 6620-2 | 
(| 6542°3 
= 6541-0 
(6465-5 
12 6466°5 
(| 6392'5 
13 | 6392°3 
| 4 
(| 63210 
1447} 6321°3 
( 
} 
() 6249°2 
15 6250°5 
6184°3 
61254 
| 6124°4 
Wave- 
number 
ina 
| mil-met. 
| 1286 °23 
| 1831°51 
1352°57 
1374°46 
1396°19 
141537? 
1435°09 
145560 
1453°48 
147369 
| 1472°41 
1492°31 
1491°92 
1510°16 
1510°54 
1528°48 
| 1528-82 
1546 °67 
1546°43 
1564°33 
1564°37 
1582°03 
1581°95 | 
1600°20 
| 1599°89 
6183°2 | 1617°29 
1617 ‘02 
1632°55 | 
1632°82 | 
a 
—— 
Wave- 
length ; 
British 
inch. 
0°000, 
030,609 
29,568 
29,108 
28,644 
28,198 
27,816 
27,434 
27,087 
26,715 
26,738 
26,382 
26,389 
26,070 
26,064 
25,757 
25,753 
25,455 
25,459 
25,167 
25,167 
24,886 
24,887 
24,603 
24,608 
24,343 
24,347 
24,115 
24,111 
Wave- 
a British 
inch. 
32,670 
33,820 
34,355 
Carry forward (numbe rs 3 and) sums of intervals, 
34,911 
35,463 
35,950 2. 
36,451 
36,918 
37,432 
37,400 
416 
37,905 
37,895 
900 
38,358 
38, 367 
362 
38, 824 
38,831 
827 
39,285 
39,279 
282 
39,734 
39,735 
734 
40,183 
40,181 
182 
40,645 
40,637 
641 
41,079 
41,072 
075 
41,467 
4] 1,474 
470 
number in 
b 
34,411 
36,9727] 
36,959 
965 
37,471 
37,463 
467 
37,948 
37,955 
951 
38,403 
38,435 
419 
38,875 
38,897 
886 
39,327 
39,335 
331 
39,782 
39,794 
788 
40,229 
40,240 
234 
40,688 
40,694 
691 
41,133 
41,137 
135 
41,511 
41,527 
519 
(ab) 
55 
47? 
51 
57 
59 
49 
50 
60 
49 
vy’ 
34,469 
35,573 
36,559 
37,015 
37,522 
38,002 ? 
38,477 
38,931 
39,386 
39,831 
40,292 
40, 737-66 
751 
41,152-204 | 
178 
41,573 
(10)532 
(ab) 
114 
110 
102? 
115 
104 
104 
97 
110 
110 
103 
103 
(10)1054 
c 
34,003 
34,536 
35,085 
36,122 
36,639 
37,096 
37,574 
(37,6012) 
587 
38,061 
38,081 
071 
38,516 
38,537 
526 
38,979 
38,989 
984 
39,437 
39,445 
441 
39,894 
39,902 
898 
40,350 
40,343 
346 
40,800 
40,800 
800 
41,246 
41,253 
249 
41,625 
41,642 
633 
(ae) 
183 
171 
164 
157 
159 
164 
164 
159 
163 
(10)1646 
a (aa) 
1150 
33,820 |(=2x 
575?) 
34,355 | 535 
34,911 556 
35,463 | 552 
35,950 % 487 
36,451 501 
36,918 | 467 
37,416 | 498 
37,900 | 484 
38,362 | 462 
38,827 | 465 
39,282 | 455 
39,734 | 452 
40,182 | 448 
40,641 459 
41,075 434 
41,470 | 395 
41,871 401 
Appearances; and standard- 
line adopted places, in 
metrical wave-lengths, and} 
in British wave-numbers, 
—————_——— | 
(? oxygen. )(*) 
Ka,, 7700|=32,987 
———S 
An air- 
line; C.P.S. 
Ka,, 7669 =33, 140 
( First two (ae). two (ac) 
J of a bright, 
sharp -lined 
| quartet (ac, 
L and ec” d?).(°) 
UH VY 
(Minimum) 
Lia, 6705°5 | =37,879 
Ha, 6562|=38,707 
—~ 
— 39,340 
Oxygen(faint) 
6456°5 
) Tube-C. ) 
@ (faint red)| > =40,327 
E * 6298-5 |) 
& 
w 
Ss 
a 
J 
_:, O (strong) | 
g 6157 = 41,254) 
r| 
5 
& Li B, 6102/=41,625 
— 
