PottoK & Lronarp—On the Spectra of Tron, &e. 223 
Curomium. (Plate XIV.) 
Spectrum 1 shows the lines of an alloy of 50 per cent. 
chromium, and 50 per cent. iron short, with gold and iron lines 
long, the iron lines of the long spectrum thus cancelling the iron 
lines in the short, and showing only the chromium lines short. 
This plan was adopted owing to the difficulty of procuring or 
making chromium free of iron. 
Spectra 2, 3, and 4 show the effects of dilution. 
QUANTITATIVE Specrrum oF CHromium CHLORIDE. 
Intensity Intensity 
Wave-length. and Wave-length. and 
Persistency. Persistency. 
) | 
-11-——_ | 3030-4 
4289-9 10y | a8 Group 
4274-9 10y | 3015-3 
4254°5 10 2988-8 So 
ee a eee 2980-9 8 
2971°9 86 
3605-5 10x 
2953-4 So 
3593-6 10x 
19 
Sle | 2843-3 10y 
3578-8 10x | 2835:2 10y 
3430°5 i0p 2830°5 10x 
3422-9 10@ fe 
3421°4 10 2766°6 SH 
3408-9 10 | 2762°7 8o 
3403-5 10¢ le 
Eire 2698°8 Sp 
| SOY) st 
3180-8 10 
2663-6 8 
3132-2 109 
2659-0 8 
ahs 2653-6 So 
3050-9 Sp Bp i ll 
