108 
DR. S. CHAPMAN ON THE SOLAR AND LUNAR 
Table IV. (2) ( b ).—Fourier Coefficients of the Lunar Diurnal Magnetic Variation, 
Reduced to the Epoch of New Moon. 
(2) Manila, 
( b) Horizontal Force. 
Season. 
Lunar 
phase. 
a\. 
V L 
«2- 
b- 2 . 
a 3 . 
b's- 
a a- 
r 
1 
- 57 
- 147 
- 64 
- 64 
-76 
- 4 
_ 2 
32 
0 
- 153 
- 38 
- 32 
- 30 
- 10 
-36 
11 
0 
3 
12 
■ 24 
39 
- 122 
- 7 
- 2 
- 14 
1 
Summer . . . - 
4 
5 
6 
- 118 
- 15 
- 77 
- 4 
- 123 
• 48 
23 
9 
-59 
- 27 
- 12 
-30 
9 
6 
22 
6 
- 146 
■ 58 
24 
70 
-20 
- 8 
0 
- 10 
7 
58 
69 
- 42 
69 
- 45 
-13 
0 
- 4 
8 
79 
- 54 
6 
- 51 
3 
- 23 
- 4 
- 1 
Mean. . 
43 
- 43 
36 
60 
-26 
- 16 
- 4 
6 
f 
1 
- 14 
- 146 
53 
— 66 
- 34 
0 
-34 
20 
2 
80 
61 
55 
56 
6 
-41 
-12 
11 
3 
- 23 
98 
- 77 
- 57 
8 
- 25 
2 
25 
Equinox . . . * 
4 
5 
- 18 
- 128 
- 78 
33 
- 50 
- 61 
80 
16 
26 
11 
0 
6 
4 
-10 
19 
- 4 
6 
96 
19 
27 
- 34 
- 12 
- 16 
- 22 
- 10 
7 
24 
68 
- 47 
63 
0 
- 61 
-33 
- 19 
l 
8 
28 
- 138 
6 
- 25 
- 13 
-27 
-28 
- 9 
Mean. . 
- 14 
26 
- 25 
50 
3 
-20 
- 17 
4 
1 
44 
- 134 
— 46 
14 
-86 
- 21 
— 46 
11 
2 
183 
- 117 
- 54 
- 88 
- 55 
4 
-11 
7 
0 
O 
17 
40 
- 19 
- 177 
-32 
-30 
- 7 
- 15 
Winter . . . - 
4 
131 
- 252 
30 
- 162 
- 24 
- 47 
- 4 
- 19 
5 
17 
- 174 
- 4 
- 135 
5 
-52 
-29 
- 14 
6 
- 161 
- 138 
- 47 
- 168 
-64 
-32 
- 10 
13 
7 
73 
- 1 
- 74 
- 163 
-26 
-46 
-32 
- 16 
8 
53 
- 126 
- 137 
- 164 
-92 
-38 
- 25 
- 2 
Mean. . 
16 
- 123 
- 51 
- 134 
-48 
- 34 
-20 
- 4 
