DIURNAL VARIATIONS OF TERRESTRIAL MAGNETISM. 
107 
Table IV. (2) (a ).—Fourier Coefficients of the Lunar Diurnal Magnetic Variation. 
Reduced to the Epoch of New Moon. 
(2) Manila. 
(a) West Declination (in Force Units). 
Season. 
Lunar 
phase. 
a\. 
b\. 
a- 2 . 
K 
a' 3 - 
v* 
a' 4. 
b\. 
r 
1 
92 
-45 
114 
- 146 
42 
-83 
19 
- 10 
2 
104 
-71 
145 
- 47 
64 
-28 
- 11 
8 
3 . 
127 
36 
162 
9 
100 
0 
- 3 
2 
Summer . . 
A 
4 
5 
71 
5 
-20 
11 
127 
102 
17 
- 30 
93 
59 
- 6 
-58 
34 
- 3 
- 12 
-20 
6 
156 
7 
181 
- 65 
75 
-61 
- 3 
-23 
7 
32 
17 
141 
- 3 
80 
-20 
16 
17 
8 
36 
19 
133 
- 3 
79 
- 23 
6 
- 21 
Mean. . 
78 
6 
138 
- 38 
74 
- 35 
7 
— 7 
. 
r 
1 
82 
- 17 
128 
70 
67 
-31 
15 
- 9 
2 
13 
40 
128 
21 
115 
-16 
36 
4 
3 
44 
27 
116 
- 32 
68 
-43 
18 
- 22 
Equinox. . 
4 
56 
29 
86 
- 28 
66 
-38 
23 
-35 
5 
77 
37 
88 
■ 67 
44 
- 19 
25 
- 1 
6 
37 
39 
57 
34 
47 
- 14 
22 
-15 
7 
17 
- 5 
146 
53 
85 
-67 
20 
- 11 
- 
8 
94 
14 
84 
- *54 
36 
- 13 
12 
- 17 
Mean. . 
52 
20 
104 
- 45 
66 
-30 
21 
- 13 
r 
1 
17 
- 74 
59 
90 
37 
-31 
20 
- 10 
2 
- 61 
34 
■ 83 
- 43 
- 70 
- 11 
- 30 
- 1 
3 
— 46 
0 
- 108 
- 92 
- 54 
- 35 
1 
- 17 
Winter . . 
. ^ 
4 
-38 
-53 
- 120 
97 
75 
-48 
-26 
- 13 
5 
-43 
-76 
92 
- 118 
- 73 
-52 
- 17 
- 5 
6 
-60 
-30 
- 102 
- 125 
53 
- 63 
6 
-27 
7 
4 
- 24 
54 
• 74 
- 46 
-28 
- 4 
15 
- 
8 
24 
-39 
20 
- 134 
- 19 
- 60 
10 
-20 
Mean. . 
- 25 
-33 
80 
- 97 
- 53 
-41 
- 6 
- 10 
