THE SOLAR SPECTRUM AT THE DATE 1877-1878. 
Colour of the 
Continuous 
Spectrum at 
the Place. 
Object Observed, generally a black, fixed 
Fraunhofer Line. 
A probable fine line, : 
Another probable fine line, 
Excessively faint and fine line, . 
Very faint thin line, 
Another, . i 
Another, 
A stronger line, 
A stronger line, 
Stronger and blacker, 
Strong, clean and black, 
stone sharp and black, . 
_ Very strong, black, thick, 
= and ae - 
the lines, . 
The same: do. do. 
Strongest of the whole: 
do. do. : . : 
Rather fainter: do. 
Still fainter: do. do. 
Fainter still, and thinner : 
do. 
do. i 
unknown. j 
|] The first of a grand bundle of close 
j lines, with haze between, 
' d Second do. do. . 
il Third do. do. 
| | Fourth do. do.. 
1] Fifth do. do. 
fee ||Sixth do. do. 
| Red. Seventh, near middle of 
undle 
ier An ziahths probable, 
| Ninth, probable, 
1K Tenth, or last, 
ip A pale space, but probably of far finer 
lines intervenes, thus . 
and then— 
pret side of a Bes gars 
Becond. side of do. 
The above 12 entries form the great A line itself, the colossus of all the Solar spectrum lines, and its chemical 
origin unknown. 
A fine, z.c., thin, line, . 
Very fine line, haze to right, 
Finest line, ; 
Suspected finest line, 
D 
0. do. 
Do. do. 
Do. do. 
VOL. XXIX. PART I. 
Appear- 
4 ance by 
Intensity | ,raphical 
of black, or aorta 
thickness oe 
of line. symbol. 
0°5 | 
0°5 ] 
0°2 ' 
0°3 ' 
0°3 
0°5 ' 
07 ' 
1°0 | 
15 | 
2°0 | 
ee ES OA. GLE 
AH Clo Pp PB ow w 
iS) 
Micrometer 
Reading. 
Rey. 
53°730 
53°900 
54°018 
54°086 
54°093 
54°129 
54°163 
54°196 
54°227 
54°256 
54°283 
54'308 
54'331 
54'353 
54374 
54394 
54418 
54'431 
54°447 
54°461 
54°481 
54492 
54‘503 
54°515 
54°528 
54°541 
54°551 
54°578 
54°607 
54°621 
54°670 
54760 
55°041 
55°110 
55°210 
55 °292 
55°409 
PLACE- 
DATA, 
from 
Angstrom’s 
Grating Nor- 
mal Solar 
Spectrum. 
33'402 
Chemical-origin- 
data from 
Angstrom, 
Thalen, &c. 
Unknown, 
but probably 
Solar rather 
than Telluric. 
Unknown, 
but probably 
Solar rather 
than Telluric, 
Concluded 
WAVE- 
NUMBER- 
PLACE, per 
British Inch. 
32 770 
32 890 
32 990 
33 027 
33 053 
33 083 
33 104 
33 135 
33 165 
33 180 
33 198 
33 214 
33 240 
33 255 
33 272 
33 281 
33 295 
33 306 
33 318 
33 330 
Differences. 
Breadths & 
Doubles. 
Mal 
12 
12 
30 
293 
Distances. 
a 
worn 
NSS 
The above 17 lines, exquisitely graduated, sharp, clean, and strangely black, like admirably engraved lines on 
a copper plate filled in with black printing ink, form the preliminary band before great A. 
Origin in chemistry 
33 500 
33 570 
33 770 
33 820 
33 895 
33 960 
34 100 
10 
40 
20 
