92 
PROFESSOR W. N. HARTLEY AND MR. W. E. ADENEY 
The Spectrum of Air (continued). 
Scale- 
Description of lines. 
Electrodes employed. 
Remarks. 
numbers. 
Copper. 
Aluminium. 
Mean. 
33-16 
33- 63 
34- 16 
34- 43 
35- 09 
35-41 
35- 97 
36- 47 
37- 03 
37- 29 
38- 50 
38- 73 
39- 23 
39-68 
39- 77 
40- 25 
40-36 
40- 97 
4]-68 
41- 98 
42- 13 
42-58 
42-94 
44- 09 
4P55 
45- 18 
47-33 
47- 83 
48- 23 
48- 97 
49- 33 
50- 30 
51- 03 
51-43 
51-88 
52T3 
53-03 
53- 57 
54- 95 
55- 85 
57-27 
57- 86 
58- 43 
58- 99 
59- 20 
59- 86 
60- 46 
61- 97 
63-07 
63- 97 
64- 92 
65"95 
f Faint, nebulous .... 
[ Faint, nebulous .... 
f Weak, sharp. 
[ Weak, sharp. 
f Weak, broad, nebulous . 
\ Weak, nebulous . . . . 
Very faint, nebulous. 
Weak, fine. 
Fairly strong, fine . . . 
Fairly strong, fine 
f Faint, fine. 
\ Fairly strong, fine 
Faint, fine. 
f Fairly strong, fine . . . 
[ Fairly strong, fine 
Strong, fine. 
Very faint, fine .... 
Faint, fine. 
p Strong, fine. 
< Strong, fine. 
[ Strong, fine. 
/ Very faint, fine 
[_ Very faint, fine . 
f Strong, broad, nebulous 
< Weak, nebulous .... 
[Faint, nebulous .... 
Very strong, sharp . 
Very faint. 
Faint, sharp, fine.... 
Strong’, fine. 
Faint, fine. 
Strong, fine. 
f Faint, nebulous .... 
J Weak, nebulous .... 
) Very faint. 
[Very faint. 
Strong, fine.. 
Weak, fine. 
Very faint. 
Weak, fine. 
["Faint, fine. 
Weak, nebulous .... 
Faint, fine. 
Faint, nebulous .... 
Weak, nebulous .... 
Weak, fine. 
PV ery faint. 
Faint, fine. 
Faint, fine. 
Faint, fine. 
Faint, fine. 
Faint, fine. 
Wave¬ 
lengths. 
4206-4 
4197-5 
4189-3 
4185-2 
4176-4 
4169-0 
4152-8 
4145-4 
4132-8 
4123-6 
4118-8 
4110-5 
j 4103-6 | 
4096-2 
4084"4 
4074-9 
4071-3 
4069-1 
4041-8 
4034-3 
4024-8 
3994-6 
3982-9 
3972-6 
3954-8 
3944-1 
3939-0 
3932-4 
3918-5 
3911-8 
3881-8 
3864-2 
3856-4 
3850-0 
3841-2 
3839-5 
3831-0 
3803-7 
3791-6 
3781-8 
3771-6 
3759-4 
Wave¬ 
lengths. 
4206-2 
4198-3 
4189-4 
4185-0 
4177-3 
4169-5 
4157-9 
4152-6 
4145-3 
4132-7 
4123-7 
4119-1 
4111-2 
4104-3 
4102-6 
4096-7 
4092-6 
4085-3 
4075-3 
4071-5 
4069-2 
4063-5 
4057-2 
4041-5 
4034-5 
4025-9 
3994-5 
3988-5 
3983-1 
3972-4 
3967-3 
3954-9 
3945-0 
3939-5 
3933-5 
3929-0 
3918-4 
3911-6 
3892-4 
3882-0 
3863-4 
3856-1 
3851-0 
3842-2 
3839-1 
3831-1 
3804-4 
3782-4 
3771-3 
3759-4 
Wave¬ 
lengths. 
4206-3 
4197-9 
4189-3 
4185-1 
4176-8 
4169-2 
4157-9 
4152-7 
4145-4 
4132-8 
4123-7 
4119-0 
4110-9 
4104-3 
4102-6 
4096-5 
4092-6 
4084-8 
4075-1 
4071-4 
4069-2 
4063'5 
405 7 "2 
4041-7 
4034-4 
4025-3 
3994-5 
3988-5 
3983-0 
3972-5 
3967"3 
3954-8 
3944" 5 
3939-2 
3932-9 
3929-0 
' 3918-5 
3911-7 
3892-4 
3881-9 
3863-8 
3856-2 
3850-0 
3841-7 
3839-3 
3831-0 
3824-0 
3804-0 
3791-6 
3782-1 
3771 5 
3759-4 
An approximation. 
