ON THE MEASUREMENTS OF WAVE-LENGTHS. 
105 
The Spectrum of Thallium (continued). 
Scale- 
numbers. 
Description of lines. 
Wave¬ 
lengths. 
Remarks. 
224-98 
Weak, continuous, fine, sharp 
2665"0 
237-82 
Weak, continuous, nebulous .... 
2608-7 
246-30 
Strong, continuous, fine, sharp . . . 
2579-7 
253-80 
Faint, long, fine. 
2551-6 
259-86 
Strong, long, with faint nimbus . . 
2530-0 
274-93 
Weak, fine, continuous. 
2477-7 
277-63 
Fairly strong, short. 
2468-9 
282-85 
Strong, short . 
2451-9 
301-30 
Fairly strong, short. 
2394-8 
306-18 
Strong, continuous, with faint nimbus 
2380-0 
311-27 
Fairly strong, short. 
2364-8 
319-32 
Faint, short, nebulous. 
2343-1 
328-61 
Weak, discontinuous, fine, sharp 
2257 0 
335-27 
Strong, long, fine, with faint nimbus . 
2299-3 
351-77 
Faint, short. 
2257-0 
357-10 
Faint, short. 
2243-7 
359-05 
Faint, continuous. 
2239 0 
368-36 
Faint, short. 
22170 
371-08 
Faint, short. 
2210-0 
Coincident with a tin line. 
373-80 
Weak, short. 
22035 
402-75 
Faint, short. 
2139-0 
The Spectrum of Copper. 
Scale- 
numbers. 
Description of lines. 
Wave¬ 
lengths. 
Remarks. 
Weak, short. 
4274-2 
No scale number was recorded for 
80-63 
Weak, short. 
3598-9 
this line. 
80-85 
Weak, short. 
3596-6 
88-21 
Faint, short. 
3523 6 
89-51 
Faint, short. 
3510-4 
92-55 
Faint, short. 
3483-2 
93-02 
Faint, short. 
3478-8 
93-81 
Faint, short. 
3471 6 
95-56 
Faint, short. 
3455-8 
96-17 
Faint, short. 
3450-1 
(104-01) 
Very faint, short, half line .... 
(3381-0) 
Probably a silver line with wave- 
113-10 
Fairly strong, short. 
3306-8 
length 3382T. 
115-10 
Fairly strong, short. 
3289-9 
116-10 
Weak, about one half scarcely visible . 
3282-1 
(116-41) 
Faint, one half only visible .... 
(3280-1) 
Probably the silver line with wave- 
117-25 
Vert strong, sharp, continuous, much 
length 3280'1. 
extended. 
3273-2 
118-38 
f Weak, short. 
3265’2 
Coincident with an air line. 
119-05 
(Faint, short. 
3260-2 
Coincident with an air line. 
120-705 
A little stronger, more extended than 
line 3273"2 ; in other respects 
similar. 
3246-9 
(121-10) 
Faint, short, half line. 
(3243-9) 
Probably an impurity. 
(122-35) 
Faint, short, half line. 
(3233-4) 
Probably an impurity. 
MDCCCLXXXIY. P 
