GASEOUS SPECTRA IN VACUUM TUBES. 
ALCOHOL TUBE, END-on—continued. 
109 
i x ms i A a Y fer C - Unclaimed 
Colour. Subject of Observation. Intensity. ae W.N. Place. || Impurities. ee eee scones ee 
Part 4 of Spectrum—continued. 
( Haze extends thus far, 0°5 50 443 Carbon 
| Faint band, 0°5 = ee on Carbon ? 
: a 50 989 
Fainter haze band, 0°3 = 51 322 Carbon ? 
Hazy line, il | S527) al 2 | Hydrogen 
Glaucous hydrogen, 6 | 52 240 || Hydrogen 
| Blue band, tube’s, , : ; 4 tin. | 52 502 Carbon 
Tube’s blue band extends ; : 
Glaucous, faintly to, . i : j 05 53 172 Carbon 
Line, supposed blow-pipe’s blue 3 " 53 631 Carbo- Carbo- 
band 1, c : : : Hydrogen | Hydrogen 
; Carbo- Carbo- 
| 
Do. do. line 2, . 1 1 53 856 Hydrogen | Hydrogen 
: : Carbo- Carbo- 
Do. do. line 3, . 0°5 l 54 050 Hydrogen | Hydrogen 
cr Carbo- Carbo- 
| Hazy band, 1 Hye 54 244 iydraseu || Elydrogen 
U Hazy line, . ‘ 1 I 54 797 Hydrogen 
Band begins sharply, 3 Ese. 56 330 Carbon 
Blue. Part 5 of Spectrum— a 
Violet band begins sharp, 3 FEE 56 320 
Indigo. Faint violet band, . ; 2 57 830 Carbon 
( Violet hydrogen, 2 | 58 515 Hydrogen 
Violet, + Band, supposed blow-pipe’s in- 2D 58 895 Carbo- 
rf tense, . ; ‘ : , ve ABH Gaset Hydrogen 
{ Line, supposed of Marsh-gas . 2 | 60 245 Marsh-gas 
Another, : . : : 1 60 529 Marsh-gas 
Another, i ; : . 1 | 60 740 Marsh-gas 
Hazy followers, from near to, . 0°3 ats 60 970 Marsh-gas 
Ronde, Do. do. up to, 61 239 Marsh-gas 
Lavender band begins, 2 “he 61 592 Carb 
Do. do. ends, OB | ne 62 002 ai aa 
Haze band, . 1 = 62 570 Carbon 
L All haze ends, 02 wo 63 068 % 
WV. B.—Olefiant-gas tried after the above, has perhaps the faintest trace of No. 1 of Marsh-gas at 60 245. 
But Marsh-gas 
has that whole group splendidly, brilliantly, viz., from 60 243 to 62 139; or shows more of the lines and bands of it by far 
than Alcohol; and Alcohol again than Olefiant-gas, 
than Alcohol ! 
Yet Olefiant-gas is far nearer in chemical constitution to Marsh-gas 
The Carbon, Hydrogen, and Carbo-hydrogen constituents of this tube appear abundantly ; but none of its Oxygen con- 
stituent ! 
More remarkable, however, is it to note in this Alcohol tube, over and above the carbon bands, known positively to be 
electric-spark carbonic manifestations, the appearance of other bands of a carburetted kind, but only known, or acknowledged 
hitherto as combustion, not as electric, bands. 
illumination. 
Yet here they are undoubtedly in nothing but faint, weak, electric 
Thus the green band, whose sharp beginning is quoted above as being in W.N. Place=48 792, is the electric, vacuum- 
tube, carbon or carbonic-oxide band of all electric observers ; and has never been seen in any lamp or candle burning freely 
in the open air. 
But the other green band, which begins with a strong line at 49 176 of W.N. Place, is the band which may be seen in the 
blue base of every carbo-hydrogen flame, lamp, candle, or anything else ; has been taken hitherto as an example and type of 
a combustion spectrum ; and yet is the green band which is seen in comets, where, on principle, there can be no combustion, 
but may be faint electrical currents. 
