Colour of the 
Continuous 
Spectrum at 
the Place. 
THE SOLAR SPECTRUM AT THE DATE 1877- 
Object Observed, generally a black, fixed 
Fraunhofer Line. 
Very fine line, 
Very fine line, 
Fine band gra- 
duating down 
to right hand 
Single fine line, 
Ist and strongest 
line, 
last, and weakest, . 
Stronger line. 
Faint line, 
Faint line, 
Suspected line, . 
Strong line, 
Double in Angstrom, 
Suspected line, . : 
Certain line, but faint and hazy, 
Strong line, "hazy and faint, 
Still stronger line and sharper, : 
Hazy band suspected, 
Fine sharp line, 
Double line, very sharp, Ist component, 
2d do. 
Fine line suspected, 
Very fine, or thin, line, 
Stronger line, 
Do. do. 
Strongest line yet, - 
Strong line, . 
An important group for identification. 
Fine band suspected, 
Fine line suspected, 
Do. do. 
Do. do. 
Very thin line, . 
Certain fine line, 
Do. do. 
appe 
3 ance by 
of black, or| Saphical 
thickness tee a 
of line. symbol 
ite | 
9 | 
2 
0-2 lh, 
1 | 
3° | 
itis fl 
1 : ! 
0°3 ' 
3° 
0°3 ' 
0°5 =H 
2° Ae 
3° | 
ne 
15) | 
2° | 
05 . 
ie I 
2° | 
2:5 | 
4: 1 
3° | 
0°4 
0°2 ' 
0°2 ' 
02 ' 
0°5 I 
ie | 
its | 
ORANGE colour ends here, and AMBER begins. 
Micrometer 
Reading. 
Rey. 
10°565 
10°620 
10°690 
10°712 
10°755 
10°820 
10°885 
10-928 
10°955 
11°045 
11°090 
11°154 
11°290 
11°473 
11°584 
11°635 
11°796 
11°828 
11°878 
11-917 
11:976 
12°040 
12185 
12°305 
12°460 
12°554 
12740 
12°820 
12°890 
12°957 
13°027 
1878. 
PLACE- 
DATA : re 
t Cher l-origin- 
angiaars |e ts 
Grating Nor- ee 
mal Solar GHG CAE 
Spectrum. 
2 
39 178 
39 231 2 
Iron. 
39 306 Tron and 
Calcium. 
39 383 Calcium. 
39 450 Calcium. 
39 500 Tron. 
Tron. 
39 621 Tron. 
Tron. 
89 692 Iron. 
39 734 Iron. 
Tron. 
Tron. 
Concluded 
WAVE- 
NUMBER- 
PLACE, per 
British Inch. 
39 149 
39 160 
39 182 
39 190 
39 202 
39 228 
39 252 
39 264 
39 274 
39 303 
39 320 
39 341 
39 386 
39 452 
39 488 
39 500 
39 563 
39 574 
39 590 
39 603 
39 623 
39 648 
39 694 
39 735 
39 788 
39 819 
39 880 
39 905 
39 930 
39 950 
39 975 
299 
Differences. 
Breadtns & 
Doubles. 
Distances 
In the Solar spectroscope, when glare is prevented by a preliminary prism, rather than by coloured glass, the 
beauty and transparency of the amber colour of this part of the spectrum is something most exquisite to behold. 
Very thin line, . 
Do. do.} . 
Fine line, 1st of three, 
2nd do. 
3rd_—s do. 
Suspected fine line, 
Very fine line, . 
Fine line certain, 
Last edge of band Pesiing to left, . 
Line, hazy, : 2 = 
Suspected line, 5 . 0 
Do. dower 
Fine and sharp double line— 
1st component, 
2nd do. 
Fainter, wider double line— 
1st component, . 
2nd component, 
Suspected fine line, 
Do. do. 
Certain fine line, 
2 | 
2 | 
3 | 
3 III 
3 j 
-0°5 1 
I | 
1:5 | 
ie = 
1 AE al 
0-5 
0'5 1 
WW 
ae EI 
15 || i 
1°5 }§! 
0'5 
0-5 
1°5 
13°182 
13°235 
13°339 
13°383 
13°420 
13°510 
13°560 
13°667 
13°750 
13°810 
13°895 
13'973 
14°048 
14:065 
147104 
14°140 
147186 
14°250 
14°288 
——— 
40 086 
Tron. 
40 207 Tron, &e. 
Tron. 
2 
40 311 Tron, &e. 
Tron. 
2 
40 024 
40 040 
40 070 
40 086 
40 099 
40 129 
40 145 
40 178 
40 206 
40 230 
40 259 
40 286 
40 310 
40 318 
40 332 
40 340 
40 350 
40 378 
40 390 
16 
30 
16 
13 
30 
16 
33 
28 
24 
29 
27 
24 
14 
10 
28 
12 
33 
