32 
DR. S. CHAPMAN ON THE SOLAR AND LUNAR 
the year, for the purposes of his paper, into summer and winter halves, and in 
comparing with his results the summer and winter data of this paper, allowance has 
been made for this by incorporating with them the equinoctial results, with half 
weight. Table H contains all the material for comparison, and will sufficiently 
indicate the probable accuracy of our present knowledge of the lunar diurnal 
magnetic variation. 
Table H (a ).—Comparison of the Lunar Semi-diurnal Magnetic Variations at Five 
Observatories, as determined by van Bemmelen (l) and in this Paper (2). 
The Unit is IQ- 7 C.G.S. 
West. 
North. 
Radial. 
Observatory. 
a 2 . 
h ■ 
(1-2. 
6 
2* 
a 2 . 
bo. 
1. 
2 # 
1. 
2 # 
1. 
2 % 
1. 
2. 
1. 
2. 
1. 
0 
JJ, 
Sunn 
mer. 
Pavlovsk . . . 
110 
112 
- 18 
5 
56 
5 
58 
86 
- 19 
- 2 
- 9 
- 3 
Pola. 
137 
122 
- 9 
33 
85 
51 
117 
103 
16 
34 
-55 
-34 
Zi-Ka-Wei . . 
191 
210 
-68 
23 
30 
9 
9 
6 
111 
112 
- 18 
27 
Manila .... 
119 
132 
-47 
-21 
- 10 
- 22 
• 29 
- 60 
- 8 
20 
-78 
-86 
Batavia. . . . 
14 
- 5 
3 
- 13 
-27 
-40 
- 43 
■ 70 
- 3 
- 4 
-38 
-34 
Winter. 
Pavlovsk . . . 
- 5 
8 
14 
18 
-35 
- 12 
- 28 
11 
- 1 
3 
- 15 
1 
Pola. 
10 
_ 2 
27 
33 
19 
28 
0 
11 
23 
23 
- 19 
- 19 
Zi-Ka-Wei . . 
35 
64 
- 56 
-40 
73 
65 
- 33 
- 50 
89 
88 
0 
38 
Manila .... 
- 34 
- 6 
-72 
-80 
-48 
-27 
- 102 
- 112 
- 54 
- 29 
-62 
-87 
Batavia.... 
- 178 
- 195 
4 
- 11 
-49 
-66 
- 60 
- 99 
3 
10 
13 
10 
Year. 
Pavlovsk . . 
53 
60 
— 2 
12 
11 
3 
15 
48 
- 10 
0 
- 12 
- 1 
Pola. 
74 
60 
9 
33 
52 
40 
59 
57 
20 
28 
-37 
-26 
Zi-Ka-Wei . 
113 
137 
-62 
- 8 
52 
37 
- 12 
— 22 
100 
100 
- 9 
32 
Manila . . . 
43 
63 
-60 
- 50 
-29 
-25 
66 
- 86 
- 31 
- 5 
-70 
-86 
Batavia. . . . 
- 82 
- 100 
4 
- 12 
-38 
-53 
- 52 
- 85 
- 3 
- 7 
- 13 
- 12 
