| Colour of the 
| Continuous 
| Specti t 
THE SOLAR SPECTRUM AT THE DATE 1877-1878. 313 
pe | ae Differences. 
Intensity | 2° ?Y_| Micrometer ATA, hanlecikasare|| Coxekees |j-_——_——= 
Object Observed, generally a black, fixed of black, by pie dae, Reading. en from, : y data fn NOE. = g a 
Fraunhofer Line. thickness ‘ive Gr ci Nor-| Angstrom, PLACE. per apes a 
of line. symbol Rev. mal Solar Thalen, &c. British tneh 3 A = 
Spectrum. ae A 
Strong line, 3 | 9-800 50 681 Tron, 50 681 13 
Fine line, . 5 j : 1 | 9°848 50 694 8 
Sharp side of a faint band, 1 = 9°883 50 702 iW 
Vanishing side of do. 0-2 — 9928 50 718 21 
Strong line, 2 | 10°008 Iron and 50 734 
con Titanium. 13 
Strong double : 1st component 2 ‘060 50 747 
P gat db, 2 | I 10-083 | (50 748 Iron. Ve Tae A |. 
Faint haze from last line ends here, . 02 = 10°170 50 770 10 
Fine line, F 1 | 10°224 Tron. 50 780 11 
Strong line, 15 ] 10°278 50 791 6 
Very fine line, . 0°5 ' 10°307 50 797 9 
Fine line, . ihe | 10°350 50 806 
7 
Fine double line : 1st component, is 10°389 Hak. 50 813 
ond ao. oma | | } 10-406 Titanium. || 59 817 || 4 - 
Very fine line, . ; 0-4 ' 10°457 50 828 14 
Fine line, . 1 | 10°522 50 842 13 
Do. 1 | 10°589 50 855 
15 
Faint band of lines : 1st and strongest, 2° | 10°660 Tron. 50 870 3 
2nd strongest, ie | | 10°680 2 50 873 3 
8rd dow ~S iw |S? ( LL!) 10-690 2 50 876 || 3 
4th and weakest, O'> | 10°710 2 50 879 
17 
Strong line, 2 | 10°798 Tron. 50 896 21 
Do. : cl 1195) | 10°898 Tron. 50 917 1 
Fine line, : : 1 | 10950 50 928 23 
Strong line or lines, . 2 | or |] | 11:070 Iron. 50 951 
Nickel, 12 
Do. do. 2 | or|[] | 11°124 50 968 5 | Sodium, and {0 963 
Titanium. 6 
Fine line, 1 | 11160 50 969 
Nickel, 7 
Haze between last line and this one, . 2 11200 Sodium, and 50 976 6 
Titanium. 
Fine line, 1 | 11°243 50 982 
Nickel, 12 
Strong line, 2 | 11°317 } Sodium, and 50 994 
Titanium. 
Nickel, 14 
Do. 2 | 11400 } Sodium, and {a 008 
Titanium. 9 
Fine line, 1 | 11°462 Iron. 51 017 WW 
Do. 1 | 11°532 51 028 - 
Do. 1 | 11°578 51 035 : 
Do. 1 | 11°620 51 042 
Strong line, 2 | 11°687 2 51 053 Be 
Fine line, 1 | 11°778 51 068 15 
5 
Triplet of fine lines: 1st component, 1 | 11°810 51 073 9 
2nd do. 1 tell 11°820 51 075 3 
3rd do. 1 | 11°840 Tron. 51 078 
; 9 
Fine double line : 1st component, 1 | 11°895 Tron. 51 087 7 
Qnd do. ie aT well 11:936 51 094 re 
Strong line, - . 2 | 12-028 Tron. 51 109 9 
Fine line, f 15 | 12°088 Tron. 51 118 19 
Very sees ; : ee 1 | 12°207 51 137 105 
ese three lines were apparently 
omitted by accident, and are taken _ l ten 7 3 
from a subsequent re-examination 2 ' eon 51 190 
«Of the spectrum, . __. : c | . 
Little c;” avery strong but 
hazy line (strong and clear line FH Fe 
in Angstrom), . . . .| 4 H 12°470 | 51 242 Iron. 51 242 
The telescope’s focus about here is very troublesome. When the above thick iron line is seen single, the small one 
is seen sharp at focussing-tube’s 15th division; but at the 25th they are blurred; and at the 35th they become sharp 
again, but with the thick iron line notably doubled by bad focus. 
Reset all the prisms for F. 
VOL. XXIX. PART I. ae % 
