336 
PROFESSOR W. H. HARTLEY OX SPECTRUM PHOTOGRAPHY 
The Lead Spectrum. 
Scale numbers. 
Wave-lengths. 
1 per cent. 
04 per cent. 
0 01 per cent. 
Hundredths of an inch. 
42-93 
4057-5 
4057 - 5 
67-61 
3738-9 
3738-9 
72-69 
3682-9 
3682-9* 
76-8 
3639-2 
3639-2 
83-31 
3572-6 
3572-6 
3572-6 
170-45 
2872-2 
2872-2f 
■ 
188-37 
2832-2 
2832-2 
190-30 
2822-1 
225-41 
2662'5 
2662-5 
237-48 
2613-4 
2613-4 
247-08 
2576-4 
373-43 
2204-3 
The Tellurium Spectrum. 
Scale numbers. 
Wavedengths. 
1 per cent. 
04 per cent. 
0'01 per cent. 
Hundredths of an inch. 
103-9 
3382-4 
3382-4 
116-43 
3280-0 
3280-0 
117-35 
3273-4 
3273-4 
120-77 
3246-8 
3246-8 
3246-8 
176-24 
2894-3 
181-25 
2867-7 
183-4 
2857-0 
344-1 
2386-3 
2386-3J 
304-92 
2383-8 
2383-8t 
355-18 
2248-0 
355-36 
2247-3§ 
357-18 
2243-3 
The Arsenic 
Spectrum. 
Seale numbers. 
Wave-lengths. 
. l 
1 per cent. 
04 per cent. 
0-01 per cent. 
Hundredths of an inch. 
183-04 
2859-7 
199-22 
2779-5 
2779-5 
316-6 
2350-1 
339-14 
2288-9 
This is an exceedingly poor spectrum. 
* Barely visible. f Very faint. 
t These lines appear very distinctly and are continnons in a 1 per cent, solution. 
^ The two last lines are faint, 2243 3 exceedingly so. 
