EARTH’S MAGNETISM AT PAVLOVSIv AND POL A (1897-1903). 
309 
Table IIa.—F ourier Coefficients of the Lunar Diurnal Magnetic Variations, 
Reduced to the Epoch of New Moon. 
Pola. Horizontal 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 ; + denotes increasing horizontal force. 
Season. 
Lunar 
phase. 
a 
V i. 
a 2 . 
b 2 . 
a 3 . 
b 3 • 
a' 4 . 
b\. 
r 
1 
14 
91 
85 
132 
78 
69 
22 
11 
2 
- 3 
150 
62 
103 
86 
67 
29 
36 
3 
119 
31 
44 
119 
35 
64 
19 
13 
Summer . . . - 
4 
5 
- 3 
56 
109 
74 
59 
167 
139 
95 
83 
87 
71 
41 
3 
54 
4 
12 
6 
8 
178 
107 
193 
95 
80 
- 11 
20 
7 
109 
10 
108 
118 
65 
61 
4 
- 9 
- 
8 
17 
110 
43 
83 
24 
43 
-24 
8 
Mean. . 
40 
94 
84 
123 
69 
62 
12 
12 
r 
1 
- 59 
26 
84 
114 
50 
42 
19 
-16 
2 
13 
92 
16 
85 
53 
45 
25 
38 
3 
26 
80 
59 
72 
36 
25 
28 
- 13 
Equinox . . . 
4 
50 
16 
21 
66 
42 
72 
14 
- 4 
5 
28 
26 
60 
50 
43 
69 
14 
- 4 
6 
81 
- 5 
16 
60 
39 
48 
33 
29 
7 
3 
102 
71 
65 
95 
51 
9 
28 
- 
8 
- 36 
94 
51 
76 
38 
66 
7 
23 
Mean. . 
13 
54 
47 
73 
50 
52 
19 
10 
- 
1 
50 
- 40 
- 21 
- 14 
- 16 
- 32 
- 14 
- 10 
2 
- 97 
51 
- 34 
27 
14 
16 
10 
6 
3 
- 42 
- 54 
7 
- 10 
5 
- 6 
6 
22 
Winter . . . < 
4 
- 15 
- 57 
33 
- 17 
13 
- 10 
-21 
-17 
5 
64 
- 86 
40 
6 
12 
23 
- 4 
- 19 
6 
2 
- 41 
23 
- 23 
-18 
16 
38 
11 
7 
82 
- 83 
52 
- 69 
- 2 
-26 
3 
12 
- 
8 
139 
- 53 
52 
3 
9 
-43 
- 9 
-16 
Mean . . 
23 
-45 
19 
- 12 
2 
- 8 
1 
- 1 
