FLAME SPECTRA AT HIGH TEMPERATURES. 
1061 
investigators. This is, however, insufficient for an analysis of the spectra, and it has^ 
therefore, been found necessary to state the wave-lengths of lines and bands with the 
wave-lengths of other lines with which they have been identified. 
Lastly, it may be remarked that there have been very few instances of reversals 
noticed. Thus, at Crewe, forty-three photographs were taken on twelves plates, and, 
at Dowlais, forty-eight photographs on ten plates; of these, only forty of the latter 
series were sufficiently well-defined for examination ; but only on one plate. No. 2, of 
the Crewe series, were the C line of hydrogen, the F line, hydrogen, and a line at N, 
seen reversed. The alkali metals showed no reversals. 
Plate 2.—Crewe. Spectrum 3. 
X. 
Description of spectrum. 
Remarks and lines for comparison. 
6707 
Line litliiuni 
6635 
Band extending to 6564 
6564 
A reversed line. Hydrogen. Seen during a snow- 
stoi’in. Coincident with the solar line C. 
6196 
> Band degraded towards th e red 
6204 More ref. edge of baud. W atts 
5990 
J 
5923 
Band narrow like a line 
5893 
Sodium line. Mean of the two. Coincident 
with D 
Plate 8.—Crewe. (Plate 14.) 
X. 
Description of sjiectrum. 
Remarks and lines for comparison. 
5876 
A band fi'equently occurring here 
5872 
Hebulous line, or indistinct less refrangible 
edge of band 
5872'! 
> Two faint lines. Watts 
5865 
5865 J 
5841 
Apparently the less refrangible edge of a band 
in the 1st spectrum; a line, or more re¬ 
frangible edge of a band in the 2nd spec¬ 
trum, and the less refrangible edge of a band 
in the 3rd spectrum 
5847 Maximum of light. X¥axts 
5787 
5767 
5718 
XVell defined line in 1st spectrum; more re- 
frang-ible edge of band in the 2nd spectrum 
Line or edge of a band which extends stronger 
up to next measurement 
Less refrangible edge of a band, not distinct 
but intense 
5790 Strong line, brightest edge of 
the whole group. Watts 
5704 
5672 
Edge of band, intense, doubtful. 
,, ,, ,, In 1st spectrum only 
5705 Fine line. Watts 
5655 
More refrangible edge of band, indistinct. Not 
distinguished in 3rd spectrum 
5644 Edge of baud. Watts 
5634 
An intense baud of rays overlies the other 
bands 
5634'7 .Carbon. Watts 
