FLAME SPECTRA AT HIGH TEMPERATURES. 
1043 
259. Red potassium line. 
233. Red lithium line. 
pi2. 
i 210. 
Group of three narrow red lines, of which the first and third are well seen. 
208. J 
201. Fellow sodium line. 
195. "I Group of three greenish lines, of which the third (184) is the brightest and always 
appears first; sometimes the' space between 199-195 filled with greenish-yellow 
lines. 
174. ' 
lt2‘5. ^ Group of three pea-green lines, the thh’d (171’5) is the brightest and the first to appear. 
171‘5. 
Group of four greenish-blue lines, of equal or similar brightness. 
)> Groups of four equally bright blue lines. 
113. 
41. 
4. 
( 2 .) 
End of a group of many blue lines equally separated from each other, which are closelj^ 
adjacent to the foregoing group. These lines arc much weaker, and can always be 
observed. 
The edges of a group of blue-violet double lines, which first make their ajipearance in 
the “ fining ” stage, but not always markedly. 
Clearly defined blue-violet Hues; it appears first in the “fining” stage simultaneously 
with the grou23 preceding it (81 and 67). 
Violet potassium line. 
Bright violet lines. 
The groups /3, y, S, and e are not composed of lines l)iit bands, and together with 
the lines at ->7 are characteristic of the Bessemer ‘‘blow.” Especially are the following 
three lines conspicuous : 184 of the group 171'5 of group y, and the violet 77 (2); 
they are the most sensitive, and they appear in the spectrum when carbonic oxide enters 
into the flame, indicating the commencement of the second period, as also their vanish¬ 
ing at the end of the process allows of the complete decarburization being recognised. 
That the lines from 113 to 41 belong to carbonic oxide could not lie determined with 
equal exactitude, though it appeared to be probable. Many bright lines undeter¬ 
mined and several dark bands supposed to be due to absorption were noticed which 
had, however, no practical interest. Lielegg described the changes in the spectrum 
at different stages of the process. It is to be noted that he attributes the bands, or 
lines as he terms them, to carbonic oxide. 
Marshall Watts, in 1867 (‘ Phil. Mag.,’ vol. 34, p. 437), communicated an 
account of a lengthened examination of the Bessemer spectrum made at the works 
of the London and North-Western Bailway, at Crewe, which had extended itself 
into an inquiry into the nature of the various spectra produced by carbon compounds. 
6 R 2 
