DIURNAL VARIATIONS OF TERRESTRIAL MAGNETISM. 
Ill 
Table IV. (3) ( b ).—Fourier Coefficients of the Lunar Diurnal Magnetic Variation, 
Reduced to the Epoch of New Moon. 
(3) Batavia. 
(6) Horizontal Force. 
Season. 
Lunar 
phase. 
a\. 
Vi. 
a, 2 . 
b 2 . 
a' 3 . 
v 3 . 
a 4- 
b\. 
Summer . . 
. s 
1 
2 
3 
4 
5 
6 
7 
8 
- 19 
- 83 
47 
- 50 
10 
38' 
40 
- 8 
- 32 
- 114 
70 
- 54 
92 
- 41 
- 28 
- 68 
- 66 
- 54 
- 20 
7 
- 71 
- 64 
- 35 
- 42 
- 70 
- 78 
- 108 
- 37 
- 62 
- 88 
- 87 
- 64 
28 
- 22 
9 
- 1 
- 3 
1 
14 
9 
9 
-42 
-40 
-27 
2 
16 
3 
- 18 
- 6 
20 
12 
- 7 
14 
3 
21 
-21 
22 
10 
11 
- 5 
18 
12 
- 9 
11 
Mean. . 
- 3 
- 39 
- 43 
74 » 
4 
- 12 
4 
9 
■ 
1 
47 
- 89 
• 57 
- 49 
— 22 
- 24 
-29 
6 
2 
30 
8 
- 93 
- 64 
- 10 
— 2 
-23 
3 
3 
- 38 
36 
- 82 
32 
-29 
12 
-21 
- 20 
Equinox . . 
4 
- 103 
22 
- 42 
■ 71 
20 
-29 
21 
0 
5 
- 28 
63 
47 
- 1 
8 
0 
- 1 
- 8 
6 
96 
- 108 
17 
- 87 
9 
- 17 
— 22 
9 
• 7 
- 31 
- 64 
1 
- 66 
17 
-37 
ii 
1 
L 
8 
- 102 
- 137 
- 154 
- 53 
-42 
- 7 
- ii 
23 
Mean. . 
i- ,16 '“ 
- 34' 
- ’61 
- 45 
- 8 
- 13 
- 9 
0 
r 
1 
- 59 
- 57 
- 64 
- 128 
-32 
-27 
- 12 
- 8 
2 
- 48 
- 26 
- 94 
- 77 
-24 
-28 
- 14 
14 
3 
59 
_ o 
- 87 
- 118 
- 31 
-39 
5 
- 6 
„ r . , 
4 
30 
- 18 
- 54 
- 123 
-23 
-43 
-20 
-35 
W inter . . 
• i 
5 
- 7 
30 
90 
- 93 
- 24 
- 4 
- 17 
-20 
6 
136 
- 77 
- 118 
- 109 
-26 
o 
— O 
' 14 
-27 
7 
78 
- 23 
- 88 
- 123 
- 22 
- 8 
-40 
4 
8 
- 26 
- 25 
- 95 
- 139 
-31 
-37 
-36 
-36 
Mean. . 
20 
- 22 
- 86 
- 112 
-27 
-38 
- 15 
- 14 
