DIURNAL VARIATIONS OF TERRESTRIAL MAGNETISM. 
17 
Table A.—The Sources of the Data Used for the Investigation of the Solar Diurnal 
Magnetic Variation. 
o ® 
Longitude 
No. of 
No. of 
Observatory. 
Latitude 
Codatitude 
from 
group. 
observatory. 
(North+ ). 
d. 
Greenwich 
(East +). 
r 
1 
Pavlovsk. 
O / 
59 41 
o / 
30 19 
o / 
30 29 
L 1 
2 
Sitka. 
57 3 
32 57 
- 135 20 
l 
3 
Ekaterinburg. 
56 50 
33 10 
60 38 
Mean .... 
57 51 
32 9. 
— 
r 
4 
Potsdam. 
52 23 
37 37 
13 4 
n. J 
5 
Irkutsk. 
52 16 
37 44 
104 19 
l 
6 
Greenwich. 
51 29 
38 31 
0 0 
Mean .... 
52 3 
37 57 
— 
m. { 
7 
Pola. 
44 52 
45 8 
13 51 
8 
Tiflis. 
41 43 
48 17 
44 48 
Mean .... 
43 17 
46 4.3 
— 
IY. { 
9 
Baldwin . . 
38 47 
51 13 
95 10 
10 
Cheltenham. 
38 44 
51 16 
- 75 50 
Mean .... 
38 46 
51 14 
— 
• Y. { 
11 
Zi-Ka-Wei. 
31 12 
58 48 
121 26 
12 
Honolulu. 
21 19 
68 41 
- 158 3 
Mean .... 
26 16 
63 44 
— 
r 
13 
Bombay. 
18 54 
71 6 
72 49 
VL \ 
14 
Vieques, Porto Rico .... 
18 9 
71 51 
65 26 
l 
.5 
Manila. 
14 35 
75 25 
120 58 
Mean .... 
17 13 
72 47 
- 
VII. | 
16 
Batavia. 
- 6 11 
96 11 
106 50 
17 
.. 1 
Samoa., 
- 13 48 
103 48 
- 171 46 
Mean .... 
- 10 0 
100 0 
f 
18 
Pilar .. 
-31 41 
121 41 
- 63 51 
VIII. ^ 
19 
Melbourne. 
- 37 50 
127 50 
144 59 
l 
20 
Christchurch. 
-43 32 
133 32 
172 37 
Mean . . . . 
1 
- 37 41 1 
127 41 
— 
IX. 
21 
Laurie Island, South Orkneys 
-60 45 
150 45 
- 45 1 
D 
VOL, CCXVIII.-A, 
