THE SOLAR SPECTRUM AT THE DATE 1877-78. 
Observations end at 1h. 15m. P.M. 
( June 24, 1878. 
Prisms 6, 8, and 4. Dispersion A to H=28”. 
10h. 15m, A.M. 
303 
Appear- PLACE Differences. 
Colour of th Intensity | 2¢° PY | Micrometer DATA. Ichemical-origin-| Concluded 2 
Sextinuons. Object Observed, generally a black, fixed of ‘bladk, al eae ee Renae) ie ae a data from saa Ee g g 
Spectrum at Fraunhofer Line. thickness He Grating Nor-| 28S8trom, | prace per = 2 5 
the Place. of line. symbol. Rey. aan Gian Thalen, &¢. | Byitich Inch. 38 z 
Spectrum. BA) A 
Yellow. Very fine double : 1st component, One alt » 16°592 43057 3 
2nd ~—s do. 07 is. 16-608 43060 7 
Fine line, . . A eS) | 16637 Titanium. 43 067 5 
Suspected fine, . ~ 0°3 ' 16658 43 072 13 
D' line; first side of it, . 16688 F 43 085 
second side, 10 | 16697 e2. CBG) Sodit 43 088 3 i 
Very clear line and sharp, 3° | 16°764 Nickel. 43 110 10 
Fainter line, but sharp, Is | 16°795 Telluric water| 43 120 
D’li | Vapour. 10 
* line; first side of it, . 16 830 : 3130 
second side, 10 16 840 || #3 130 | Sodiuins 23 134 LE) 
Suspected faint line or band, 0°5 ' 16°926 43 161 18 
Certain fine sharp line, i: 16'976 Tron. 43 179 19 
Suspected fine line (reset prisms), 05 , 11°845 43 198 10 
Do. do. 05 ' 11°870 Telluric water} 43 208 
vapour. 22 
Suspected band, 0°7 = 11:900 43 220 17 
Suspected fine line, 0°5 ' 11'948 Telluric water] 43 237 
vapour, 14 
Suspected band, F 07 = 11°985 43 251 9 
Suspected line, 0°5 ' 12°010 43 260 
66 
Suspicion of a line, 0°5 ' 12°183 43 326 12 
Certain very fine line, 16 | 12220 Tron. 43 338 6 
Suspicion of a line, 0°5 ' 12°243 Iron. 43 344 24 
Fine line, clean and sharp, 15 | 12°327 43 368 Calcium. 43 368 x 
12 
Suspicion of a band, . 07 = 12°360 43 380 14 
} Fine line, . WUD) | 12°402 43 394 1 
Yellow. | Strongest line hereabouts, Bs | 12°456 43 404 Barium. 43 405 11 
Excessively fine line, 1:0 | 12°486 43 416 
16 
Very thin but wide double ; 1st line, 10 || 12°543 43 432 rl 
Qnd line, | 1:0 | ;!! 12°585 43 443 
28 
4 Excessively fine line, certain, ne? | 12°690 43 471 102 
Finest possible line, . : 07 F 13075 43 573 102 
} Strong fine line, ; ; - i155) | 13°488 43 675 Tron. 43 675 7 
7 Thin faint band, : “ js 07 = 13°517 43 682 
i" 42 
‘ Very thin but certain fine line, . 1:0 | 13664 Iron. 43 724 20 
fi Do. do. 1:0 | 13°732 43 744 “6 
: Do. do. 1:0 | 13°763 43 750 
12 
Beginning of band fading to right, 1:0 = 13°797 Tron. 43 762 46 
Another band fading to Fae, 1:0 = 13946 Tron. 43 808 35 
Very fine line, . A 1:0 \ 14:068 43 843 
Beginning of a faint band, 1:0 ee 14128 Iron. 43 860 zs 
End of same, fading away, 01 = 14133 43 862 
20 
Line painfully thin, . 06 F 14°208 43 882 7 
Do. do, ; 0°6 14925 43 889 16 
Narrow band ; beginning, 0'7 = 14280 43 905 13 
end, 07 = 14°315 43 918 13 
Single very fine line, lc | 14:370 Copper. 43 931 16 
Very faint band, o3 | = 14-412 Barium, | 43 947 33 
Fine line, . iy | 14°558 Tron, 43 990 10 
Do. ile | 14583 44 000 20 
Do. : le | 14'640 44 020 20 
| Yellow. Suspicion of a line, 3 0°5 ; 14°720 44 040 
42 
Double, strong ; 1st component, 3° | | 14°872 44 082 Iron. 44 082 6 
Do. 2nd : 2° ij! 14890 44 088 
