76 PROFESSOR J. N. LOCKYER ON THE PHOTOGRAPHIC 
Il. TABLE oF WAVE-LENGTHS. 
Tasie [.—Lines Photographed in the Spectrum of the Orion Nebula, Feb. 10, 1890. 















Micrometer Wave- Photographic | Probable | Wave-length of pro- Re 
: 5 : Sits me marks. 
reading. length. intensity. origins. bable origins. 
3°3672 3707 2 
3 8632 8715 1 
3°3565 3729 6 
33455 | 3743 ul | 
3°3410 | 3752 | 1 A 3749°8 H,, 
3°3310 3770 | 1 H 3769°4 H, 
3°3200 | 3796 2 H 3796-9 Hg 
3°3020 383 2 H 38345 H, 
3°2950 | 3847 ut 
3°2910 3855 | 1 
3°2850 | 3868 | 4 
3°2762 | 3887 + H 3887°8 He 
3°2690 3902 2 
3°2656 3910 1 
3°2565 3933 2 Ca 3933 K line, Solar Spect. 
3°2525 3941 | 1 
3°2495 3949 | 1 
3:24.15 3968 | 5 Ca 38968 H. 
3°2356 3984 1 
32295 4.000 3 
3:2251 4010 2 
3 2197 4025 3 
3°2136 | 4041 1 
372185 | 4054. 2 
32035 | 4067 2 
31969 | 4086 1 
Ss 1915 | 4101 6 H 4101 Hs 
31849 | 4120 1 
31818 | 4129 1 
31771 4142 1 
31722 4154 2 
31682 4167 1 | 
3°1560 42.04. 1 
31491 4226 1 (Cer | 4.226 Flame line 
31464 4234 H | | 
| 31360 4269 2 | | 
| 31160 4340 6 H 4340 Hy 
3-103 4385 1 | Fe 4383 Strongest flame line of 
3° 1020 4389 2 iron 
| 30972 4410 ] | 
3:0929 4426 2 | 
30810 4471 4 | Lorenzonr’s f. 
30750 4495 3 | 
30645 4539 2 
| 3:04.50 4.627 2 
| 3:0275 4715 2 
| 3:0230 4735 1 C 4736 
3°0070 4824. 3 
| 3°0040 4839 2 
| 3°0000 4861 6 ace | 4861 He 
2:9935 4897 3 
2-9892 4.923 3 
2°9835 4957 4 
2:9750 5006°5 5 Mg 5006°5 “Chief ” line 


