ON THE MEASUREMENTS OE WAVE-LENGTHS. 
117 
The Spectrum of Lead (continued). 
Scale- 
numbers. 
Description of lines. 
Wave¬ 
lengths. 
Remarks. 
288-61 
f Faint, short. 
2432-3 
289-89 
1 Faint, short. 
2427-8 
295-49 
Faint, discontinuous, fine. 
2411-2 
298-73 
Weak, discontinuous, fine. 
2402-1 
30T43 
Strong, continuous. 
2393-7 
302-53 
Faint, fine, short. 
2390-8 
303-15 
Faint, fine, short. 
2389 0 
322-60 
Faint, fine, discontinuous. 
2333-3 
335-82 
Faint, short. 
2297-7 
355-32 
Strong, continuous. 
2247-9 
359-40 
Faint, continuous. 
2238-2 
373-43 
Strong, continuous, somewhat nebulous , 
with a nimbus. 
2204-3 
388-35 
Weak, discontinuous. 
2170-0 
The Spectrum of Tellurium. 
Scale- 
numbers. 
Description of lines. 
Wave¬ 
lengths. 
Remarks. 
6-48 
f Faint, short. 
4707-5 
There is a nimbus throughout the 
7-12 
(_ Faint, short. 
4593-0 
whole extent of this spectrum 
11-31 
Weak, short. 
4602-0 
where the points of the elec- 
17-10 
f Weak, short. 
4487-0 
trodes have made an impression 
17-51 
[ Weak, short. 
4480-0 
upon the plate, but it may be 
19-88 
W eak, short. 
4436-0 
remarked that the continuous 
21-76 
Weak, short. 
44000 
lines show no distinct nimbus, 
22-94 
Weak, fine, short. 
4378-0 
neither are they, as a rule, 
23-69 
Weak, short. 
4364-5 
nebulous. The large number 
24-33 
Weak, short. 
43530 
of short lines in this spectrum 
25-94 
Faint, short. 
4324-6 
is remarkable. But few of the 
27-32 
Fairly strong, short. 
4301-5 
lines are extended, they are 
27-78 
f Faint, short. 
4292-7 
those with wave-lengths 3382"4, 
28-10 
|_ Faint, short. 
4287-3 
3280-0, 3273-4, 2413-3, 2386’3, 
28-94 
Fairly strong, short. 
4274-4 
2383-8, 2247-3, and 2243'3. 
29-72 
Fairly strong, short. 
4259-8 
32-18 
Fairly strong, short. 
4221-1 
34-70 
f Weak, short. 
4180-7 
35-36 
f Faint, short. 
4170-3 
38-70 
Faint, short. 
4119-7 
41-83 
Weak, short. 
4072-7 
42-64 
Fairly strong, short. 
4061-3 
43-10 
Fairly strong, short. 
4054-2 
43-60 
Faint, short. 
4048-3 
46"60 
Strong, short. 
4006-0 
48-20 
Fairly strong, short. 
3983-8 
49-30 
Fairly strong, short. 
3968-6 
50-80 
Fairly strong, shoi’t. 
3948-0 
51-96 
Weak, short. 
3932-5 
53-76 
Weak, short, nebulous. 
3908-7 
