| Colour of the 
Continuous 
Spectrum at 
| the Place. 
THE SOLAR SPECTRUM AT THE DATE 1877-1878. 
Strong double line : 1st component, . 
2nd component, 
(Stronger of the two in Angstrom) 
Fine line, Z ” 3 $ 
Do. 
Do. : Z c ” : 
Strong double line ; 1st component, . 
(Faint and single in Angstrom) 
2nd component, 
NOoOoOoN w 
aa 
bo 
/ 
Band (a single excessively strong line 
in Angstrom)— 
begins with a double line, 
suspicion of a line, . 
end of band, . 
co Ont 
“ wor 
Strong and sharp line, 
Strong line, 
Fine line, 
Strong line, 
HoH 
“wo 
oO 
ie) 
Suspicion of a line, 
Sharp line, : 5 
Faint and hazy line, 
Strong line, : 
Sharp line, 0 : 
Very strong and sharp, 
WHHOoH 
“WoO ~” 
Strong sharp line repeated, 
Fine line, . : ; : 
Strong line, 
Finer line, 
Fine line, 
Strong line, 
Fine line, 
PDH ep eH oo 
od 
Decided line, . i ‘ 
Strongest line hereabouts, . 
Strongline, . : : : 2 
Fine line, . 
Strong line, : ; : ; 
Double line, strong: 1st component, 
2nd do. 
DmwnewhF pw 
Decided line, 
Clear line, 
Strong line, 
Fine line, . 
Faint band, 
OHwHe 
od 0d 
a" 
NO Ot 
Double line : 1st component, 
2nd do. : é 
Strong! line (but only a fine line, 
Ist component of a very faint 
double, in Angstrom), . : c 3 
VOL. XXIX. PART I. 
eee 
Intensity | 20C° DY 
Object Observed, generally a black, fixed of black, Se ary 
Fraunhofer Line. thickness Awe 
of line. symbol 
1°5 | 
Band of lines—beginning, 6 ; oF 
end); AD 0°3 li 
Sharp line, : c : ; 7 2" | 
Hazy line, ; : : ; 13 
Fine line, 5 5 ; ; i ¥ | 
Sharp line, : hi : : ‘ 15 | 
Micrometer 
Reading. 
Rey. 
15-062 
15125 
15°187 
15°229 
15265 
15°315 
15°372 
15°653 
15°677 
15°764 
15°785 
15°805 
15°832 
15°873 
15918 
15°930 
15°950 
16°308 
16°360 
16°403 
16°453 
16°490 
16°575 
16°607 
16°650 
16°715 
16°757 
8196 
8°222 
8°257 
8°312 
8°357 
8°395 
8°500 
8°580 
8667 
8760 
8°825 
8°868 
8925 
8°950 
9:022 
9-080 
9175 
9-208 
9°418 
9°500 
9°533 
9°750 
305 
PLACE- Differences. 
‘irom’ |Cheniettorigi-| “wave [2a] g 
mal Solar | Thalen, &e. |! British toch, | 32 3 
Spectrum. 5A A 
Titanium. 45 009 
Tron. 45 027 16 18 
2 45 043 
Iron. 45 056 18 
45 066 10 
45 080 14 
Iron. 45 097 17 
70 
45 167 Tron ? 45 167 
6 
Tron. 45 173 
45 197 af 
45 202 5 
45 207 9 
45 216 
11 
45 227 
11 
45 238 Tron. 45238 || , 
45 240 8 
45 248 
92 
45 341 Tron and 45 340 
calcium. 11 
Calcium. 45 351 12 
45 363 : 
45376 | Iron and 45 376 18 
calcium, 11 
' 45 387 
21 
45 409 Calcium. 45 408 8 
45 416 9 
Tron. 45 425 18 
Calcium. 45 443 
45 455 | Caleium. 45 454 iW 
The image of the Sun thereby was exquisitely 
45 455 Calcium. 
45 473 Tron. 
Tron. 
Calcium. 
lron. 
Tron. 
45 586 Tron. 
45 611 Tron. 
Titanium. 
2 
Tron. 
45 728 Tron. 
45 820 2 
45 825 [ron. 
45 455 
45 462 
45 471 
45 487 
45 500 
45 512 
45 588 
45 560 
45 582 
45 609 
45 627 
45 640 
45 659 
45 667 
45 689 
45 708 
45 730 
45 741 
45 800 
45 820 
45 830 
45 893 
At 11h. a.m. shortened focus of collimator, readjusted prisms, and used blue glass, and silver-on-glass mirror, in 
place of the usual quick-silvered glass, as a temporary experiment. 
single, and optically good, but the dines in the spectroscope were not better, perhaps not so good, which I attributed 
chiefly to the silver-on-glass mirror being rather smaller than the other. 
