CYANOGEN. Very Otp TuseE (END-on). 
GASEOUS SPECTRA IN VACUUM TUBES. 
(CN. Carbon and Nitrogen.) 
121 
February 28, 1880. 
Six mouths further change are seen here on the “ Old Cyanogen tube” observed in July 1879; Hydrogen 
impurity has grown largely. Carbon bands have notably decreased, also those of Nitrogen ; but special Cyanogen 
lines are stronger and more numerous. 
Colour. 
Red. 
Scarlet-Red. 
Light-Red. 
Orange. 
Yellow. 
Citron, 
Green. 
Subject of Observation. 
Part 1. 
Three faint Nitrogen-like bands, 
Part 2. 
Nitrogen-like band, 
Red Hydrogen (grown ! !) 
Nitrogen-like bands, 
Strong line followed by a band, 
Another line, haze, , A 
and then a very black space. 
Very firm band, 
Do. do. 
Do., but fainter, 
Salt line apparently ! 
Part 3. 
Salt line repeated, 
Three Nitrogen-like bands, 
Thin line in a black space, 
Very remarkable group of clean 
graduated lines in black space, . 
Remains of Carbon’s Citron band, . 
A band in a now beginning hazy 
region, 0 
Do. do. ¢ 
Band of haze, almost resolvable 
into lines, . ; ; : 
‘Line in hazy region, i 
Broad band of just resolved lines, . 
Very black space follows. 
Grand clean green line, . 
Remains of Carbon’s Green band, . 
Black space in midst of which Green 
Giant should be, but it is abso- 
lutely not. | 
VOL. XXX. PART I. 
Intensity. 
~~ 
Fea}: 
— 
mow YP wo 
Sy wy Ss 
—_— 
——~— 
ooo 
bo Heo 
SAAN TKD 
Appear- 
ance, 
W.N, 
Place. 
491 
706 
946 
293 
469 
672 
940 
322 
608 
879 
314 
792 
562 
846 
135 
4 
| | Sodium 
is 
Impurities, 
Hydrogen 
Oxygen ? 
Hydrogen? 
Hydrogen ?+ 
Hydrogen ? 
| 
Constituents 
dissociated. 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
and 
Carbon ? 
Nitrogen ? 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen ? 
Carbon 
Nitrogen 
Nitrogen? 
Nitrogen 
2 
2 
Carbon 
Left unclaimed 
for Cyanogen 
(very Old). 
2 
Cyanogen 
(_ True 
| Cyanogen 
{ group 
| beginning 
L 44 706 
Cyanogen 
48 562 
