94 
PROFESSOR W. N. HARTLEY AND MR. W. E. ADENEY 
The Spectrum of Air (continued). 
Scale- 
numbers. 
Description of lines. 
Electrodes employed. 
Eemarks. 
Copper. 
Aluminium. 
Mean. 
Wave- 
Wave- 
Wave- 
lengths. 
lengths. 
lengths. 
152-01 
Faint, fine. 
3034-9 
3034-9 
153-77 
Weak, fine. 
3024-1 
3024-1 
154-86 
Faint, fine. 
3016-1 
3016-1 
156-27 
Strong, fine. 
3006-7 
3007-4 
3007-0 
In the antimony and ar- 
160-45 
Weak, fine. 
2983-0 
2982-6 
2982-8 
senic spectra a metallic 
164-59 
Faint, fine. 
2959-7 
2959-3 
2959-5 
line falls near this, 
178-35 
f Faint, fine, sharp.... 
2884-6 
2884-6 
and its character is 
178-87 
^ Faint, fine, sharp.... 
2880-4 
2880-4 
altered. In other spec- 
189-975 
Weak, nebulous .... 
2822-8 
2823-3 
2323-1 
tra it generally appears 
194-935 
Faint, fine. 
2799-0 
2800-0 
2799-5 
stronger, and in cad- 
mium it is strong 
throughout its length, 
but in the case of the 
above spectra it is 
* 
strongest in the centre. 
205-615 
Very faint, fine .... 
2748-8 
2748-8 
This and following num- 
208-955 
Faint, fine. 
2733-2* 
bers from the indium, 
213-875 
Faint, broad, nebulous . 
2710-1 
17-26 plate. 
241-375 
Mery faint. 
2598-4 
*The line2733"2is strongest 
243-105 
Faint, fine. 
2591-8 
in the centre, thinning 
246-175 
Faint, fine. 
2580-0 
away at each end. 
261-85 
Weak, nebulous, broad . 
2522-1 
274-78 
Weak, fine, sharp 
, 
2478-1 
279-42 
Very faint, nebulous. 
2463-0 
282-29 
Faint, fine. 
2453-8 
284-80 
Fairly strong, fine 
2445-2 
288-56 
Fairly, strong, fine . 
2433-6 
291-58 
Weak, nebulous .... 
2423-8 
293-37 
Faint, fine. 
2418-6 
294-15 
Very faint, fine .... 
2416-2 
295-60 
Very faint, fine . . . . 
2411-7 
296-95 
Very faint, fine . . . . 
2407-7 
299-975 
Very faint, fine .... 
. , 
2398-3 
302-555 
Very faint, fine .... 
2390-7 
322-86 
Very faint, broad, nebulous 
2332-2 
328-21 
Fairly strong, broad 
-2318-1 
333-25 
Very faint, fine, sharp . . 
2314-4 
334-23 
Faint, fine, sharp . . 
23013 
2301-8 
2301-8 
335-62 
Faint, fine, sharp 
2297-6 
22980 
2298-0 
1 From the zinc and bis- 
337-14 
Faint, fine, sharp 
2294-1 
2294-2 
2294-2 
| muth prism spectra. 
338-35 
Very faint, fine, sharp . 
2291-0 
339-00 
Very faint, fine, sharp . 
. , 
2289-3 
354-51 
Very faint, nebulous 
2250-2 
381-19 
Very faint, nebulous 
21860 
An approximation. 
