116 
PROFESSOR W. N. HARTLEY AND MR. W. E. ADENET 
The Spectrum of Lead (continued). 
Scale- 
numbers. 
Description of lines. 
Wave¬ 
lengths. 
Remarks. 
72-13 
Weak, very short. 
3688-8 
72-69 
Strong, continuous, fine, extended . . 
3682-9 
73' 75 
Strong, CONTINUOUS, fine, with a nim- 
bus at ends. 
3671-0 
75-23 
Strong, very short. 
3656-1 
76‘80 
Strong, continuous, extended, fine . . 
3639-2 
81-35 
/ Fairly strong, very short. 
3591-9 
81-77 
| Fairly strong, very short. 
3590-5 
83-31 
Strong, continuous, extended, fine . . 
3572-6 
94-11 
f Weak, very short. 
3563-9 
94-47 
| Weak, very short. 
3562-2 
92-41 
Weak, very short. 
3484-3 
95-66 
Weak, short, nebulous. 
3455"9 
112-74 
Faint, very short. 
3308-9 
114-04 
Weak, very short. 
3296-8 
116-60 
f Fairly strong, very short. 
3278-5 
116-98 
{_ Fairly strong, very short. 
3276-9 
121-38 
Fairly strona, short. 
3242-4 
122-22 
Weak, continuous, with a nimbus at 
the ends. 
3219-9 
130-46 
Vert strong, short, with a nimbus. 
3176-0 
136-09 
Strong, short, with a nimbus 
3137-3 
143'45 
J Weak, very short. 
3088-5 
143-68 
\ Weak, very short. 
3086-7 
149-20 
Weak, very short. 
3051-1 
150-52 
Strong, short, with a nimbus 
3043-3 
152-56 
Weak, very short. 
3030-2 
154-78 
Weak, discontinuous, nebulous . 
3016’5 
161-27 
Faint, very short. 
2978-8 
166-33 
Weak, short, nebulous. 
2949-2 
170-45 
Strong, continuous, fine, extended . . 
2872-2 
181-06 
Faint, very short, fine. 
2867-8 
182-25 
Strong, very short. 
Strong, continuous, fine, extended . . 
2863-2 
188-37 
2832-2 
190-30 
Strong, continuous, fine, extended . . 
2822-1 
194-67 
Vert strong, continuous, fine, extended, 
with a nimbus. 
2801-4 
212-87 
Weak, short. 
2716-3 
217"26 
Weak, short. 
2697-2 
225-41 
Strong, continuous, extended, fine . . 
Fairly strong, nebulous, short .... 
2662-5 
228-47 
2650-0 
231-54 
Faint, very short. 
2637-5 
233-91 
Faint, short, fine. 
2627-4 
237-48 
Vert strong, continuous, extended, 
with a nimbus. 
2613-4 
247-08 
Strong, continuous, fine. 
2576-4 
249-44 
Weak, very short. 
2567-2 
251-01 
Strong, very short, with a nimbus . 
2561-6 
259-11 
JWeak, short, broad, and nebulous! 
\ band J 
2539 9 
2523-4 
These measurements are taken on 
each side of the band. This 
269-85 
Faint, short, nebulous. 
2496-0 
band is a remarkable pecu- 
275-39 
Strong, continuous. 
2475-7 
liarity of the lead spectrum. 
279-41 
Faint, very short, nebulous .... 
2462-8 
284-61 
f Weak, discontinuous. 
2445-7 
285-29 
< Weak, continuous, fine, faint in the 
centre . 
2443-6 
