ON THE MEASUREMENTS OF WAVE-LENGTHS. 
115 
The Spectrum of Tin (continued). 
Scale- 
numbers. 
Description of lines. 
Wave¬ 
lengths. 
Remarks. 
305-84 
Weak, discontinuous. 
2381-1 
310-11 
Strong, discontinuous. 
2368-3 
314-85 
Vert strong, continuous, extended 
2355-0 
321-94 
Strong, discontinuous. 
2335-3 
328-34 
Strong, continuous, nebulous .... 
2317-9 
339-65 
Fairly strong , discontinuous .... 
2288-1 
346-58 
f Strong, discontinuous, nebulous . . . 
2270-0 
347-25 
< Faint, short. 
2268-6 
347-63 
(Weak, short. 
2267-1 
355-83 
Strong, discontinuous. 
2247-0 
361-43 
Faint, discontinuous, fine. 
2233-2 
362-92 
Strong, very short. 
2229-6 
366-29 
Strong, very short. 
2221-5 
368-88 
Weak, very short. 
2215-2 
371-01 
Fairly strong, discontinuous .... 
2210-1 
375-50 
Weak, short. 
2199-2 
377-48 
Weak, short. 
2195-0 
396-95 
Weak, short. 
2151-2 
411-70 
Faint, short. 
2119-2 
414-65 
Faint, discontinuous. 
2113-6 
430-84 
Faint, short. 
2079-3 
437-64 
Faint, short. 
2066-1 
The Spectrum of Lead. 
Scale- 
numbers. 
Description of lines. 
Wave¬ 
lengths. 
Remarks. 
21-76 
Faint, short. 
4399-4 
The very short lines in this spectrum, 
22-50 
Very strong, short, sharp, extended . 
4386-4 
which are also strong, are 
29-12 
Weak, very short. 
4271-4 
surrounded by a nimbus which 
30-71 
Very strong, discontinuous, broad, 
gives them a somewhat nebu- 
sharp, extended. 
4245-3 
lous appearance. There are 
34-68 
Faint, short. 
4180-9 
several nebulous lines, as for 
42-63 
f Weak, discontinuous, fine. 
4061-5 
instance those with wave- 
42-93 
\ Strong, continuous, extended, sharp . 
4057-5 
lengths 3591-9, 3555'9, 3278-5, 
45-58 
Faint, discontinuous, very fine . 
4020-5 
3016-5, 2949-2, 2650, and a 
49-72 
Faint, very short. 
3961-5 
broad nebula extending from 
50-47 
Weak, very short. 
3951-7 
2540 to 2523-4. 
51-84 
f Faint, very short. 
3934-0 
52-29 
\ Faint, very short. 
3927-5 
53-60 
Weak, short. 
3910-4 
58-13 
( Strong, very short. 
3853-2 
58-97 
J Strong, very short. 
3842-9 
59-77 
] Strong, very short. 
3832-5 
60-18 
(Weak, very short. 
3827-5 
63-61 
Strong, short . 
3785-9 
67-61 
Strong, continuous, fine, extended . . 
3738-9 
68-15 
Faint, very short. 
3734-3 
69-67 
Weak, short, broad, nebulous 
37170 
70-38 
Faint, short, nebulous. 
37090 
