222 
THE ASTRONOMER ROYAL 
Table III. 
Magnetic Tendencies to the North, formed by smoothing the numbers of Table I. 
The unit is 0 00001 of Total Horizontal Magnetic Force, and the sign is everywhere positive. 
Greenwich 
1866 
1865 
Mean 
and 
1867. 
and 
1866 and 1867. 
1865, 1866, and 1867. 
Solar 
1867. 
1867. 
Time. 
Jan. 
Feb. 
March. 
April. 
May. 
June. 
July. 
August. 
Sept. 
Oct. 
Nov. 
Dec. 
0 
42 
59 
68 
55 
48 
42 
52 
60 
58 
47 
37 
37 
1 
45 
65 
72 
57 
51 
47 
54 
63 
60 
48 
39 
39 
2 
48 
69 
75 
57 
51 
49 
55 
64 
60 
49 
42 
39 
3 
49 
71 
76 
56 
51 
50 
55 
64 
59 
49 
44 
40 
4 
48 
71 
76 
56 
51 
50 
55 
64 
59 
49 
45 
40 
5 
47 
71 
75 
56 
51 
49 
56 
64 
59 
49 
44 
40 
6 
46 
69 
73 
54 
49 
47 
56 
61 
58 
48 
41 
38 
7 
44 
64 
72 
51 
45 
45 
53 
57 
55 
46 
37 
37 
8 
41 
58 
70 
47 
40 
41 
47 
53 
51 
45 
35 
35 
9 
39 
53 
68 
43 
36 
37 
41 
49 
48 
43 
35 
35 
10 
37 
50 
67 
41 
34 
34 
35 
47 
47 
41 
35 
34 
11 
35 
50 
66 
41 
34 
33 
32 
46 
46 
39 
36 
35 
12 
37 
52 
65 
41 
34 
34 
32 
46 
47 
39 
37 
36 
13 
40 
55 
63 
43 
35 
34 
34 
47 
48 
39 
38 
38 
14 
44 
58 
63 
44 
36 
35 
36 
48 
49 
40 
40 
40 
15 
48 
59 
64 
44 
37 
35 
37 
49 
50 
42 
41 
41 
16 
52 
59 
65 
43 
36 
34 
37 
49 
51 
43 
41 
42 
*17 
53 
59 
65 
41 
35 
33 
37 
47 
49 
42 
41 
42 
18 
51 
58 
63 
38 
33 
30 
35 
43 
45 
40 
39 
42 
19 
47 
56 
61 
35 
31 
29 
33 
40 
41 
37 
35 
40 
20 
43 
53 
58 
33 
29 
28 
32 
38 
39 
35 
32 
38 
21 
39 
51 
57 
36 
31 
29 
34 
41 
40 
35 
31 
36 
22 
37 
52 
59 
42 
36 
32 
40 
47 
46 
38 
33 
36 
23 
38 
55 
64 
49 
42 
37 
47 
54 
53 
43 
35 
37 
Table IV. 
Hour. 
Magnetic Tendencies to the West, formed by smoothing the numbers of Table II. 
The unit is 0-00001 of Total Horizontal Magnetic Force, and the sign is everywhere positiv 
e. 
Greenwich 
1866 
1865 
Mean 
and 
1867. 
and 
1866 and 1867. 
1865, 1866, and 1867. 
Solar 
1867. 
1867. 
Time. 
Jan. 
Feb. 
March. 
April. 
May. 
June. 
J uly. 
August. 
Sept. 
Oct. 
Nov. 
Dec. 
0 
135 
156 
155 
121 
123 
101 
117 
129 
124 
117 
125 
131 
1 
139 
163 
160 
124 
127 
106 
120 
133 
125 
116 
129 
131 
9 
140 
166 
160 
123 
127 
107 
119 
132 
123 
113 
132 
131 
3 
139 
165 
157 
121 
125 
106 
116 
130 
120 
110 
133 
132 
4 
139 
163 
154 
120 
124 
105 
115 
128 
117 
109 
132 
133 
5 
137 
162 
151 
119 
123 
102 
115 
126 
114 
107 
129 
132 
6 
135 
158 
149 
117 
119 
99 
114 
121 
109 
105 
125 
129 
7 
132 
150 
147 
113 
111 
94 
109 
116 
103 
101 
120 
125 
8 
128 
139 
144 
107 
104 
88 
101 
109 
96 
98 
116 
122 
9 
125 
130 
142 
100 
97 
83 
91 
102 
92 
97 
115 
122 
10 
121 
125 
141 
95 
93 
79 
82 
97 
91 
96 
115 
122 
1 1 
119 
125 
141 
93 
92 
79 
78 
95 
91 
96 
116 
123 
12 
120 
127 
139 
93 
93 
80 
78 
94 
93 
96 
118 
125 
13 
126 
131 
138 
94 
94 
81 
80 
95 
95 
97 
120 
127 
14 
133 
136 
137 
95 
95 
82 
83 
98 
97 
99 
123 
129 
15 
139 
140 
137 
95 
95 
83 
85 
100 
99 
101 
124 
132 
16 
143 
141 
138 
94 
95 
82 
85 
103 
100 
103 
125 
133 
17 
144 
141 
137 
91 
93 
80 
83 
105 
99 
103 
124 
135 
18 
142 
140 
134 
86 
91 
77 
81 
102 
94 
101 
1 22 
134 
19 
138 
137 
132 
81 
88 
74 
80 
96 
90 
99 
119 
133 
20 
133 
134 
130 
80 
89 
75 
81 
94 
92 
96 
116 
130 
21 
129 
133 
131 
86 
94 
79 
87 
99 
95 
99 
115 
129 
22 
129 
137 
137 
97 
103 
85 
98 
109 
105 
105 
117 
129 
23 
131 
146 
1 47 
111 
H4 
94 
100 
120 
117 
113 
120 
129 
