FLAME SPECTRA AT HIGH TEMPERATURES. 
1053 
The red and green bands first appeared at 11.46 a.m. The lines are distinct at the 
beginning of the second exposure. 
This plate had each spectrum finely focussed all through. The spectrum of the 
spiegel-eisen was shown by the band in the greenish-yellow, and the pair of lines in 
the violet. The importance of these violet lines as a leading feature of the manganese 
spectrum is thus demonstrated. 
Plate 8 . “Blow” 69. Small tyres and rails. Vessel No. 2 . 
The 230sition of the image of the flame on the slit was vertical. An Ilford 
isochroniatic plate, not stained. A sun spectrum was photographed with 15 seconds 
exposure. (See Plate 14, lower spectra.) 
h. 
ni. 
Duration of exposure 
Commencement of “ blow ”. 
... 1 
32 
1st exposure at. 
.... 1 
40 
4 minutes 
2nd „ . 
.... 1 
44 
3 „ 
3id „ . 
.... 1 
47 
2 „ 
End of “ blow ”. 
.... 1 
49 
This is a very useful series of spectra, the focus being good and the sun spectrum 
being convenient for comparison. The manganese bands are well seen, and all the 
lines extending into the ultra-violet. This plate was enlarged 10 diameters for 
convenience in identifying the lines. 
Plate 9. “ Blow” 71. Small tyres and rails. Vessel No. 2. 
The image of the flame was diagonal on the slit of the spectroscope. An Ilford 
instantaneous plate was used, without stain. 
Commencement of “ blow ” . . 
1st exposure, the sodium line seen at 
2nd 
3rd 
4th 
n 
J5 
5th „ 
End of “ blow ’’ 
li. m. 
3 39 
3 43 
3 43 
3 47 
3 48 
3 50 
Duration of e-xposurc. 
4 minutes 
This series was well focussed all througli. 
