DIURNAL VARIATIONS OF TERRESTRIAL MAGNETISM. 
105 
Table IV. (l) ( b ).—Fourier Coefficients of the Lunar Diurnal Magnetic Variation, 
Reduced to the Epoch of New Moon. 
(1) Zi-Ka-Wei. 
( b) Horizontal Force. 
Season. 
Lunar 
phase. 
CL ]_. 
b\. 
#2* 
b 2 . 
a' 3 . 
b 3- 
a 4 . 
b\. 
r 
1 
40 
33 
112 
- 24 
43 
- 6 
- 8 
-20 
2 
- 13 
67 
14 
46 
50 
11 
4 
8 
3 
- 13 
■ 20 
38 
- 55 
36 
27 
- 13 
_ 2 
Summer . . . ■ 
4 
5 
- 83 
41 
28 
54 
- 3 
- 35 
12 
- 31 
- 17 
- 6 
22 
- 18 
- 25 
- 1 
25 
1 
6 
■ 48 
68 
6 
- 34 
30 
36 
- 3 
20 
7 
6 
53 
30 
15 
2 
9 
1 
21 
L 
8 
- 15 
18 
8 
8 
35 
24 
7 
3 
Mean. . 
- 11 
38 
21 
- 8 
22 
13 
- 5 
7 
f 
1 
- 33 
22 
13 
5 
10 
44 
- 13 
10 
2 
68 
27 
38 
61 
38 
31 
- 4 
34 
3 
- 37 
125 
- 24 
- 9 
18 
23 
12 
18 
Equinox . . . - 
4 
5 
- 42 
- 137 
4 
160 
- 19 
1 
- 35 
76 
50 
39 
1 
83 
23 
12 
32 
25 
6 
151 
5 
40 
54 
0 
38 
5 
23 
7 
- 60 
49 
45 
85 
62 
6 
- 15 
4 
8 
- 116 
83 
2 
■ 20 
-24 
o 
O 
- 19 
9 
Mean. . 
- 26 
39 
12 
27 
24 
29 
0 
19 
■ 
1 
55 
- 38 
108 
77 
25 
-20 
— 2 
25 
2 
- 74 
- 89 
15 
- 154 
3 
- 42 
2 
- 13 
3 
45 
- 123 
110 
- 175 
37 
-28 
12 
9 
Winter . . . - 
4 
5 
94 
91 
- 182 
- 64 
119 
82 
- 139 
61 
40 
24 
-52 
- 3 
23 
- 7 
- 9 
17 
6 
95 
9 
85 
- 100 
68 
- 19 
44 
4 
7 
158 
- 14 
53 
- 56 
26 
6 
- 1 
- 18 
8 
105 
13 
74 
- 101 
- 1 
-32 
0 
6 
16 
Mean. . 
71 
- 66 
81 
- 108 
28 
-24 
9 
4 
VOL. COXVIII.-A. 
P 
