GASEOUS SPECTRA IN VACUUM TUBES. 119 
CYANOGEN. Op Tube. 
Symbol=Cy or CN. Carbon and Nitrogen. 
An old and rather used-up example ; so that its light is no longer white but pink ; and the inside of the 
bulbs hazy. Observed J uly 8, 1879. 
‘ A 5 A - iy, Constituent: Unclaimed 
Colour. Subject of Observation. Intensity. eed W.N. Place. || Impurities. atancet pene fetnes a fos 
Visions of bands, like those which eh 0-1 
low, but only of . 6 
( Line, faint, 3 r j ¥ : 1 | ' 36 250 Nitrogen 
Red, 
Band, first and faintest of a arse meen 36 720 : 
l lar series, 2 Hi 37 080 Nitrogen 
Another and ten A : 3 2°5 sis aa ei Nitrogen 
Do. donee 5 ; : 3 af aoe Nitrogen 
Scarlet- # 38 302 : 
Red. Do. do. : ° 35 38 612 Nitrogen 
Red Hydrogen (the merest pas ; 0°3 5 38 712 Hydrogen 
t Band again, 5 : i . : 3°5 | HH } a ee Nitrogen 
( Do. : 2 é : : 3°5 } 8 ak Nitrogen 
Light- 
Red { 39 624 - | 
: | Do. : : ° ¢ : 3'2 39 980 Nitrogen | 
\ | 
: 40 115 : 
fa Do. : : ; ; ; 27 : 40 445 Nitrogen 
Do. : ; . ; : 2°5 } re ae : Nitrogen 
41 038 (No ; 
| Do. 2 : 41 365 Oxygen) Nitrogen ? 
| Do. ; : : : 4 1°3 Ht } re one Nitrogen? 
| This last band faintest of the set of 11 similar breadth bands, also split down the middle by a black line ; 
aie | afterwards begins a new and bright series of 7 similar breadth bands; as in THALEN’s Nitrous Oxide, by 
Be. | others called Nitrogen. 
| 
| Very strong, well-defined band, . : 4 re ve Nitrogen 
42, 230 4 
| Do. do. : c 4 42 570 Nitrogen 
| Do. do. 4 2 4 HE } Fe one Nitrogen 
ree 42 974 ; 
l Do. do. ; . 4 He } 43 249 Nitrogen 
{ 
Do. do. < ; 4 HH } ra a Nitrogen 
Yellow. 
Do. do. : : 4 a ae Nitrogen 
( 
f Last band of this set, . : ‘ = 4 : a oD Nitrogen 
Citron. 
These two series of most remarkable and regular bands in Cyanogen are still more like THALEN’s Bi-oxide 
of Azote, other’s Nitrogen, than the Nitrogen tube itself. The Hydrogen has only lately come into view. 
