DR. S. CHAPMAN ON THE SOLAR AND LUNAR 
] 12 
Table IV. (3) (c).—Fourier Coefficients of the Lunar Diurnal Magnetic Variation, 
Deduced to the Epoch of New Moon. 
(3) Batavia. 
(c) Vertical Force (Upwards). 
Season. 
Lunar 
phase. 
a\. 
V i. 
«2- 
h. 
a' 3 . 
b's- 
a 4 . 
b\. 
1 
- 6 
-36 
- 12 
25 
- 5 
0 
- 12 
5 
2 
- 21 
- 4 
18 
49 
15 
11 
15 
5 
3 
3 
-22 
8 
35 
- 1 
- 13 
Q 
— O 
- 7 
Summer . . 
* 'l 
4 
5 
- 8 
9 
- 16 
9 
33 
-21 
73 
34 
- 13 
- 4 
5 
f-t 
1 
8 
7 
- 5 
6 
6 
- 13 
-47 
3 
26 
8 
- 1 
5 
- 2 
7 
18 
- 12 
14 
43 
7 
— 7 
3 
- 1 
8 
-21 
-20 
3 
23 
8 
■ 8 
7 
1 
• 
Mean. . 
- 8 
- 19 
4 
38 
0 
_ 2 
4 
0 
1 
44 
- 24 
34 
18 
6 
6 
- 12 
- 5 
2 
42 
- 11 
19 
- 10 
25 
- 11 
— 2 
7 
3 
- 8 
8 
- 4 
48 
6 
■ 7 
2 
- 11 
Equinox . . 
4 
5 
8 
38 
6 
12 
10 
3 
19 
33 
4 
— 2 
8 
-20 
3 
2 
6 
- 8 
6 
16 
-41 
27 
23 
20 
- 4 
16 
- 9 
7 
7 
- 7 
32 
22 
17 
- 8 
1 
0 
- 
8 
- 16 
-53 
14 
58 
0 
7 
21 
6 
Mean. . 
16 
- 14 
16 
26 
10 
5 
4 
- 5 
r 
1 
23 
-47 
8 
-69 
-20 
-55 
- 25 
- 15 
2 
- 16 
-78 
-31 
- 40 
-34 
-45 
- 17 
1 
3 
64 
-21 
Q 9 
OO 
- 19 
- 18 
- 31 
- 7 
— 22 
Winter . . 
4 
5 
- 17 
12 
-31 
22 
-10 
22 
— 22 
- 19 
- 11 
18 
- 27 
- 8 
- 12 
- 8 
- 17 
- 10 
6 
- 2 
-25 
- 18 
- 17 
7 
- 37 
8 
-37 
7 
49 
- 42 
18 
- 21 
7 
-38 
5 
- 9 
- 
8 
11 
19 
13 
-28 
- 3 
-52 
- 14 
-26 
Mean. . 
16 
- 25 
5 
-29 
■ 7 
-37 
- 10 
- 17 
