olour of the 
Jontinuous 
spectrum at: 
the Place. 
THE SOLAR SPECTRUM AT THE DATE 1877-78. 
Object Observed, generally a black, fixed 
Fraunhofer Line. 
Fine line, 
Very powerful and close 
double— 
Ist line, 
Qnd do. 
Intensity 
of black, or 
thickness 
of line. 
Strong line (not in ek om), - 
Fine line, 6 
Do. 
Very fine line, 
Triplet: 1st line, . 
2nd, and chief line, 
8rd, and last line, 
Very powerful line, and 
thick a : : ; : 
Strong line, 
Do. 
Very Boer ane abick 
line, . 
Fine line (not in Angstrom), 
Do. do. 
Double line: 1st component, 
2nd do. 
Double line: 1st component, 
2nd_=s do. 
Very strong — 
Strong line, . 
Fine line, . 
Do. A : 
Do. ; 
Very powerful and thick 
ime... . 
Strong line, 
Do. 
Fine line, 
Strong line, 
Fine line, 
Very strong line, 
Fine line, 
Strong line, 
Fine line, 
Powerful line, . 
oo omg 
Hows prwpwrnm nwnwprwny gg) 
a 
Bmw © 
ol Hore Mm bo 
Appear- 
ance by 
graphical 
compara- 
tive 
symbol. 
—— 
~_“ 
— 
—o 
— 
—— 
(From 61 667 to 61 880 entirely blank in Angstrom). 
Powerful line, 
Very strong line, 
Strong line, 
Fine line, g 
Very fine line, . 
Powerful line, 
Strong line, : 
Micrometer 
Reading. 
Rey. 
17°735 
17°834 
17°851 
17°898 
17-914 
18°004 
18016 
18°120 
187145 
187163 
PLACE 
DATA, 
from 
Angstrom’s 
Grating Nor- 
mal Solar 
Spectrum. 
ay 305 
18 oie 61 440 
18297 
18°354 
18393 | 61478 
18°485 
18°520 
18°586 
18594 
18°662 
18°695 
18'790 
18°800 
18843 
18°865 
18°910 
18953 
18°975 
19001 
19-054 
19°135 
19°145 
19195 
19°232 
19:297 
19°330 
19°361 
19°390 
19°415 
61 667 
301 
Chemical-origin- 
data from 
Angstrom, 
Thalen, &c. 
Tron. 
Tron. 
Tron. 
Tron. 
Concluded 
WAVE- 
NUMBER- 
PLACE, per 
British Inch. 
61 271 
61 302 
61 308 
61 322 
61 328 
61 
61 
358 
362 
61 
61 
61 
394 
402 
408 
61 442 
61 450 
61 470 
61 480 
61 509 
61 520 
61 538 
61 542 
61 
61 
61 
61 
563 
575 
602 
606 
61620 
61 626 
61 639 
61 653 
61 659 
61 667 
61 682 
61 708 
61 712 
61 727 
61 738 
61757 
61 768 
61 779 
61 787 
61795 
61808 
61 811 
61 818 
61 823 
61 833 
61 844 
61 863 
Differences. 
Breadths & 
Doubles. 
Distances. 
| 
oo 
Ho oO “I Co 
19 
7 
