EARTH’S MAGNETISM AT PAYLOYSK AND POLA (1897-1903). 
313 
Table IV a. —Fourier Coefficients of the Lunar Diurnal Magnetic Variations, 
Reduced to the Epoch of New Moon. 
Pola. Vertical Force. 
The unit of force is 10 7 C.G.S. ; the small corrections mentioned in §§ 5, 6 have not 
been applied at this stage, cf. § 9 ; + means increasing downward force. 
Season. 
Lunar 
phase. 
a\. 
V i. 
«2- 
K 
a 3. 
b'& 
a 4 . 
b\. 
1 
-49 
49 
-44 
35 
- 18 
31 
- 2 
9 
2 
12 
- 17 
-48 
36 
-21 
10 
9 
- 4 
3 
11 
9 
-46 
36 
-43 
16 
- 10 
- 10 
Summer 
4 
-54 
16 
-51 
47 
- 24 
33 
- 0 
6 
5 
4 
11 
-42 
48 
- 8 
22 
- 6 
0 
6 
-18 
28 
-47 
71 
- 14 
22 
- 9 
0 
7 
23 
-21 
-50 
33 
-26 
31 
- 0 
10 
- 
8 
-26 
- 2 
-48 
11 
-21 
- 2 
- 17 
11 
Mean. . 
-12 
9 
-47 
40 
-22 
20 
- 4 
3 
- 
1 
-52 
50 
17 
25 
13 
9 
5 
7 
2 
-28 
-27 
-32 
7 
- 29 
10 
5 
6 
3 
-71 
56 
-21 
14 
6 
5 
7 
15 
Equinox . . . - 
4 
52 
- 2 
- 13 
54 
- 3 
21 
-10 
19 
5 
- 1 
-57 
-15 
5 
-25 
10 
- 15 
14 
6 
-69 
31 
7 
56 
- 3 
- 9 
-27 
26 
7 
38 
-20 
32 
20 
27 
45 
22 
11 
- 
8 
15 
- 19 
-25 
5 
- 8 
17 
- 1 
13 
Mean. . 
- 14 
2 
- 6 
23 
- 3 
13 
- 2 
14 
r 
1 
-30 
-23 
- 7 
- 10 
-10 
- 8 
- 13 
- 10 
2 
53 
48 
-34 
40 
3 
7 
15 
10 
3 
-68 
2 
- 55 
19 
-29 
1 
2 
-21 
"Winter , •< 
4 
- 10 
51 
-46 
27 
- 1 
- 13 
- 15 
- 2 
5 
- 18 
-54 
-24 
31 
1 
3 
6 
- 2 
6 
- 4 
31 
-18 
7 
- 6 
- 5 
8 
1 
7 
- 0 
19 
- 25 
25 
- 5 
0 
3 
5 
- 
8 
-21 
-13 
-27 
- 7 
- 5 
12 
- 1 
19 
Mean. . 
- 12 
8 
-30 
17 
- 7 
0 
1 
0 
2 S 
VOL. CCXIV.—A. 
