Colour. 
Glaucous, 
Blue. 
Indigo. 
Violet. 
- Lavender. 
Partib: 
GASEOUS SPECTRA IN VACUUM TUBES. 
IODIWN E—continued. 
Subject of Observation. 
Part 4—continued. 
Strong line preceded by a faint 
One) : : : ; 
Black space follows. 
All these iodine lines are bright 
and clear, but thick and 
coarse, ; - : 
Faint indication, 
Trace of Violet 
Line, . : 
A faint band, 
Hazy band of lines, 
Hazy line, : 
Hazy band, 
Hydrogen, 
Hazy band 
Intensity. 5g at W.N. Place. 
TK 
Broader haze band, 
SCOPHNNWHRROO 
Sas 
= 
ee 
TTA 
= 
Tem 
MD eet eee ee op 
ee) 
ANWISAnsvso Adson 
= 
n 
x 
COrPrHRHHEpPON 
_ 
oO 
[es} 
CORHHHOOH CO HO 
WANSWSOAAIS © OA 
Impurities. 
58 530 
End of Spectrum. 
6” condensed spark 
spectral lines of 
Inten- 
sity. 
Iodine, 
W.N. Place. 
54 788 
129. 
Left for Iodine 
at low, as well 
as high, 
temperature. 
‘This spectrum is most peculiar for its freedom from nearly all known impurities of the other gases, and for consisting almost 
entirely of lines ; not however the sharpest order of lines, for they remind one more of straws than needles. 
enerally in position, very like the 6” condensed spark spectra lines ; especially if we allow that the one only strong case of 
ivergence, viz., that in the Green, is due to an error in the tabular spectrum referred to. 
VOL, XXX. PART I. 
They seem 
