FLAME SPECTRA AT HIGH TEMPERATURES. 
1051 
The photographs were valuable as showing the extent of the spectrum, and 
occurrence of a large number of lines in the ultra-violet, which had never been 
observed in the Bessemer flame before. The plates had been much over-exposed. 
Plate 2. 
Edwards’ isochromatic instantaneous plate, stained with cyanine. 
h. 
m. 
s. 
Duration of 
exposure 
Commencemeut of the “ blow ” . . 
. . 9 
55 
0 A.M. 
1 st exposure comnieuced at ... . 
. . 10 
1 
30 
5 minutes 
2iici ,, ,, . . . . 
. . 10 
G 
30 
95 
3i'cl „ „ . . . . 
. . 10 
10 
0 
5 
59 
4th „ „ . . . . 
. . 10 
15 
0 
59 
End of “blow”. 
. . 10 
16 
30 
These photographs w'ere not well focussed. Tiie lithium red line and band near 
to it were just barely visible. The position of the image of the flame on the slit of 
the spectroscope was diagonal. 
Plate 3. “ Blow ” 46. Boiler-plate, 
Edwards’ isochromatic instantaneous plate, stained with cyanine. The position of 
the image of flame on the slit plate was diagonal. 
h. 
m. 
s. 
Duration of exposure. 
Commencement of “ blow” at 
. . . 11 
17 
30 A.ii. 
1st exposure began at. 
. . . 11 
26 
0 
3 minutes 
2nd „ ,, . 
. . . 11 
29 
0 
• > 
o „ 
. . . 11 
32 
0 
o 
^ 99 
Plate 4. “ Blow ”48. Boiler-plate. 
Edwards’ isochromatic instantaneous plate, stained with cyanine. The focus of 
the instrument was altered for different exposures by shifting the camera slide. 
b. 
m. 
s. 
Duration of exposure, 
Commencement of “ blow ” . 
1 
46 
30 p.M. 
Appearance of the sodium line at . 
• 
. 1 
53 
0 
1st exposure at. 
. 1 
65 
0 
2^ minutes 
2*id „ . 
1 
57 
30 
2-^ 
To. 
1 
59 
45 
3rd exposure at . 
O 
0 
0 
o 
•• 99 
4th „ ... . , , 
o 
2 
0 
If 
End of “blow”. 
o 
3 
-15 
■ 
6 s 2 
