THE SOLAR SPECTRUM AT THE DATE 1877-1878. 301 
Appear- i ACE- cee Differences. 
“Colour of th ; Intensity | @2¢¢ DY | Micromete ATA, —|Chemical-origin-y Concluded ||/> 
Pentingous Object Obseryed, generally a black, fixed of black, 7 ee Roadie. ue ory qaitos WaReR: 2 é g 
Spectrum at Fraunhofer Line. thickness eo Hye Grating Noe: Angstrom, PL ACE ner = rs 8 
abe Place. Gung: symbol NEE mal Solar Toalen; ide. British Inch. 5 8 2 
Spectrum. Fy A fa) 
Exquisitely fine close double— 
1st component EDs ell 10°813 bh . 41 176 
2nd do. ? 15 | ll 10°824 41 177 Calcium. 41 178 2 
Very faint, wider double— 16 
1st component, Oi II 6 10°866 41 194 8 
2nd do. 07 | 10°890 41 202 
11 
Amber. | Fine line, 15 | 10'928 2 41 213 5 
Strong clear line, . : 2°5 | 10°951 41 223 Calcium. 41 226 
Very faint. close double— 3 
1st component, 0°5 final r 10°962 41 229 9 
2nd do. 05 1 § 10°970 41 231 19 
Fine line, : 10 \ 11-030 Sodium. 41 250 18 
Stronger line, : : 2 | 11°080 41 268 4 
Clear line, 6 ‘ . . 1°3 | 11°093 Sodium. 41 272 16 
Do. do. 15 | 11°145 Iron. 41 288 
18 
Do. do. i! | 11°198 ; 41 306 10 
Strong line, 2° | 11°225 Tron. 41 316 20 
Very fine line, . 1:0 | 11°280 41 336 24 
Strong clear line, 3° | 11352 41 360 Barium. 41 360 
28 
Strong double : 1st and weaker, 1 | 11°434 41 388 Tron. 41 388 8 
2nd and stronger, 2 15! | 11°457 41 394 Tron. 41 396 35 
Finest of lines, . ; 0°5 11°550 41 431 30 
Do. do. . 07 \ 11°630 Titanium. 41 461 21 
Suspected line, . 0°5 ' 11°690 41 482 
12 
Strong clear line, 2°5 | 11°741 Calcium. 41 494 19 
Finest of lines, . if | 11°795 41 513 21 
Fine line, . 1°5 ! 11°855 Nickel. 41 534 35 
Very finest. of lines, : . 0°8 ' 11:954 Barium. 41 569 19 
Fine line, . ‘ : 3 ‘A 5 12 H 12:015 Nickel. 41 588 
Strong fine line ; single in Angstrom ; ue 
double here: Ist, . : 1-5) || 127110 oe 41 621 
2nd, 1 |) Il 12128 EE, ly CBee he atone "PO | 
Very finest of lines, . 07 ' 12245 41 668 
20 
Do. do. 07 ' 12°305 41 688 17 
Do. do. 0°5 ' 12°350 41 705 14 
Do. do. 5 5 - 0°6 ' 12°393 Titanium. 41 719 21 
Do., and double : Ist component, . 05 |i 12°465 41 740 5 
2nd —s do., 0°5 ny 12°485 41 745 
8 
Suspected line, . 0:3 ' 12°515 41 753 Bl 
Fine line, . 0°8 | 12°555 Titanium. 41 764 8 
Suspected line, . > : 05 ' 12°574 41 772 17 
Fine line, double : 1st component, os || 12°623 | 41 789 2 
2nd do., stronger, 15 | I 12634 41 790 Iron. 41 791 89 
Clear fine single line, : : 10 | 12°890 41 880 Tron and 41 880 
Titanium. 16 
Suspicion of fine line, A 0°5 ' 12942 41 896 39 
Fine clean line, : - Pp 13 | 13083 Tron. 41 935 - 83 
Very fine line, Vi i 13°385 42 018 122 
Fine and sharp, ills 1 13°708 Tron. 42, 140 
25 
Strong, fine, and heP, ON | 13°776 42 167 Tron. 42 165 15 
Do., do. 2° | 13°823 42 180 8 
Stronger and sharp, : 3° | 13°864 42 185 | Manganese. || 42 188 a 
Fine line and sharp, . 15 | 13°932 42 198 Tron. 42 200 25 
Do. do. 1: | 13998 Manganese. 42, 225 9 
Very fine line, . 0°5 - 14:027 Manganese. 42 234 a 
Fine and close double, perhaps triple— 
Ist, : 15 || 14°100 Manganese. || 42 257 4 
Didueae. (ny: \| 147110 42 261 || = 
3rd, 2 0°3 
VOL. XXIX. PART I. 
