GASEOUS SPECTRA IN VACUUM TUBES. 127 
IODINE (=I). March 6 and 8, 1880. 
6” condensed spark | 
lines of Iodine. Left for Iodine 
Colour. Subject of Observation. Intensity. Aupear- W.N. Place. Impurities. at ee 
| ee W.N. Place. temperature. 
Part 1. 
Clear line, 15 | 36 490 2 37 020 
Red. Do, do, 08 | 36 768 2 37 216 
Do. do. 2°0 | 37 334 2 37 590 
Do. do. 0°5 | 37 792 2 37 967 
Part 2. 
Strong line, , oko 2 I 38 097 | 
Scarlet-Red. Band of perhaps finer lines, 1 38 337 2 38 252 | x 
Strong line, , 15 I 38 566 2 38 625 x 
a pee a popareully. Red Hydro- 18 1 38 711 Hydrogen 
, oD 
Light-Red. Haze bands in a region of ee 1& 2 ips 2 39 113 |x 
or scarcely resolved linelets, O'S || seu: 39 843 
|) ( 2°0 I 40 049 2 40 069 |x 
0-2 1 | 40 203 
0°4 1 40 354 2 40 368 |x 
0-4 1 | 40 428 
0°4 ; 40 502 
| 2-0 1 | 40 586 4 | 40 594 |x 
Orange. eae clear and rather coarse j Ae : \ a ee 4 40 901 |x 
ines, . . 5 5 
| 1& | 41 235 2 41 172 
o7 5) 41 316 2 | 41 273 
3 I 41 466 10 41 428 |x 
1& I 41 741 2 41 727 
a5] | 41 854 10 | 41 824 |x 
_—_——_—_———_ L 1:0 I 42 051 2 41 865 
Faint double line, . 07 42 250 
Band of exquisitely graduated 10& | 42 404 | 
thin lines, , 0-1 lq] 42 579 
Brightest line yet, . 3°5 | 42 709 10 42 646 |x 
Strong line, 1°3 | 42 911 2 42 906 |x 
Line, 0'9 | 43 088 2 43 131 |x 
Yellow. 
Part 3. 
Clear line, 06 | 43 236 1 43 299 |x 
Faint line, 0°3 | 43 423 
Stronger line, 0°6 | 43 540 
Do. do. 0°6 | 43 680 2 43 634 |x 
(2 1 | 43 867 4 | 43 867 |x 
4 | 43 971 10 43 968 |x 
3 1 | 44 097 10 | 44074 |x 
4 I 44 269 10 | 44 258 |x 
3 1 | 44 479 10 | 44 460 |x 
| 3 | 44 620 10 44 591 |x 
2 1 | 44 723 10 | 44 695 |x 
1 I 45 011 2 44 964 |x 
| 5 I | 45 146 10 | 45100 |x 
1 \ 45 245 4 45 196 |x 
Citron. All these lines. clear and with | 2°5 45 357 ; ie oye $ 
black space between, but 0-2 ; ! 45 449 
they are thick and coarse, 0-5 ; 45 603 
1 ; 45 738 2 | 45 700 |x 
1 I 45 971 2 45 931 |x 
1 l 46 114 4 46 089 |x 
6:0 | 46 216 CS 46 189 |x 
46 232 |x 
| mo |, 46 335 | } aeillene sac 
70 H | 46 462 10 | 46 451 |x 
60 | & 46 698 8 | 46 683 |x 
10 I 46 827 2 46 847 |x 
7:0 | 46 982 10 47 018 |x 
