Magnetic Declination, 1845. 
3 
TABLE III. — Diurnal Range of Magnetic Declination for each Civil Day, as deduced from the 
Hourly Observations, with the Mean for each Week in 1845. 
Civil 
Day. 
Jan. 
Feb. 
March. 
April. 
iMay. 
June. 
July. 
Aug. 
Sept. 
Oct. 
Nov. 
Dec. 
1 
9-71 
' 
6-68 
14-08 
' 
10-34 
21-21 
' 
[15-50] 
14-43 
' 
29-87 
' 
15-44 
' 
13-52 
' 
18-17 
' 
5-18 
2 
10-65 
[10-37] 
[14-69] 
12-99 
9-53 
10-76 
8-70 
19-87 
2000 
8-50 
[14-92] 
12-13 
3 
3-81 
7-73 
9-53 
16-86 
12-17 
10-76 
10-87 
[17-36] 
19-74 
15-78 
12-56 
31-83 
4 
3-74 
11-70 
7-24 
14-23 
[13-36] 
17-54 
14-59 
16-88 
15-20 
8-39 
12-91 
20-17 
5 
[ 5-57] 
15-54 
6-58 
13-94 
9-93 
13-22 
9-87 
10-97 
16-34 
[10-73] 
23-98 
10-51 
6 
2-62 
14-84 
7-40 
[14-34] 
13-19 
13-39 
[12-59] 
13-03 
13-65 
11-62 
4-87 
8-80 
7 
7-73 
13-11 
11-36 
13-89 
14-14 
16-46 
15-06 
11-42 
[14-50] 
10-59 
16-27 
[ 9-51] 
8 
4-89 
5-69 
9-06 
13-18 
12-36 
[14-88] 
14-76 
21-60 
20-69 
9-49 
7-18 
6-86 
9 
37-83 
[ 9-96] 
[ 9-84] 
13-97 
14-56 
19-31 
10-39 
18-79 
11-06 
30-88 
[ 9-76] 
3-79 
10 
31-14 
13-33 
10-38 
12-34 
11-17 
15-76 
14-69 
[14-65] 
10-05 
26-76 
13-95 
6-95 
11 
9-86 
6-76 
13-34 
14-95 
[13-22] 
11-16 
13-86 
11-63 
16-42 
9-21 
9-18 
5-28 
12 
[18-78] 
6-05 
7-48 
15-35 
14-41 
14-03 
9-38 
11-44 
13-36 
[14-94] 
7-11 
6-67 
13 
9-38 
8-07 
12-24 
[22-48] 
12-71 
12-28 
[12-70] 
13-03 
14-90 
6-31 
4-15 
32-87 
14 
9-82 
5-00 
19-71 
67-37 
14-14 
15-86 
12-52 
9-37 
[16-02] 
6-58 
5-06 
[15-63] 
15 
14-65 
3-26 
15-38 
15-11 
17-26 
[12-56] 
13-60 
19-75 
7-58 
9-89 
4-63 
27-56 
16 
5-80 
[ 5-90] 
[16-20] 
9-77 
18-44 
12-83 
12-15 
15-49 
13-89 
9-22 
[11-48] 
12-79 
17 
6-76 
7-86 
15-59 
10-10 
11-20 
9-24 
15-14 
[14-86] 
30-00 
20-70 
25-30 
8-61 
18 
6-92 
5-54 
16-25 
18-30 
[15-81] 
11-14 
13-99 
18-52 
27-22 
13-16 
21-02 
15-49 
19 
[13-70] 
5-67 
18-05 
17-56 
19-31 
14-16 
16-15 
13-36 
18-84 
[19-52] 
8-70 
3-50 
20 
40-16 
15-26 
19-12 
[14-58] 
15-76 
15-21 
[14-14] 
12-65 
13-29 
22-61 
6-82 
8-21 
21 
16-35 
22-74 
11-32 
13-44 
12-91 
18-42 
11-03 
14-78 
[15-47] 
36-57 
6-33 
[ 7-60] 
22 
6-20 
14-81 
14-49 
12-63 
18-07 
[14-20] 
13-05 
15-71 
10-71 
14-85 
9-74 
5-49 
23 
19-98 
[20-66] 
[18-64] 
15-47 
12-44 
13-39 
15-48 
18-49 
9-08 
5-52 
[ 8-13] 
6-73 
24 
17-56 
33-12 
20-68 
15-11 
14-38 
13-88 
12-02 
[15-63] 
13-71 
11-69 
10-47 
6-20 
25 
17-84 
17-84 
26-63 
18-34 
[11-91] 
10-17 
26-07 
16-15 
29-96 
13-26 
8-44 
4-22 
26 
[19-81] 
20-20 
19-59 
14-90 
8-19 
11-92 
11-00 
16-77 
11-74 
[ 9-69] 
6-98 
5-01 
27 
18-34 
29-63 
13-88 
[16-51] 
9-01 
13-86 
[13-38] 
11-91 
34-57 
8-20 
9-91 
6-39 
28 
19-68 
21-06 
22-25 
22-18 
9-38 
18-28 
9-06 
12-41 
[19-25] 
11-27 
10-19 
[ 8-17] 
29 
25-48 
17-51 
14-39 
10-87 
[13-08] 
10-90 
37-11 
11-12 
8-23 
10-56 
4-07 
30 
15-00 
[14-50] 
14-16 
14-40 
11-29 
11-23 
22-00 
14-60 
7-70 
[13-30] 
16-99 
31 
5-58 
10-02 
28-70 
13-55 
[21-12] 
14-19 
12-36 
TABLE IV. — Means of the Diurnal Rano-es of Mag-netic Declination, vs^ith reference to the 
Moon's Age and Declination, for 1845. 
Moon's 
Age. 
Mean 
Range. 
Moon's 
Age. 
Mean 
Range. 
After 
Moon 
farthest. 
North. 
Mean 
Range. 
After 
Moon 
farthest 
North. 
Mean 
Range. 
Day. 
Day. 
Day. 
Day. 
15 
14-33 
0 
12-07 
6 
13-97 
14 
12-33 
16 
16-75 
1 
14-54 
1 
15-57 
15 
11-07 
17 
15-51 
2 
14-51 
2 
17-90 
16 
12-10 
18 
17-29 
3 
12-90 
3 
18-86 
17 
18-82 
19 
16-24 
4 
14-54 
4 
13-88 
18 
1509 
20 
15-74 
5 
12-78 
5 
16-68 
19 
12-79 
21 
17-28 
6 
13-65 
6 
13-14 
20 
11-32 
22 
12-93 
7 
12-94 
7 
15-62 
21 
11-03 
23 
11-82 
8 
16-92 
8 
15-30 
22 
13-95 
24 
12-54 
9 
12-05 
9 
14-54 
23 
14-15 
25 
12-25 
10 
11-30 
10 
14-52 
24 
10-41 
26 
13-75 
11 
12-11 
11 
13-56 
25 
11-50 
27 
11-37 
12 
13-98 
12 
11-25 
26 
11-94 
28 
12-39 
13 
11-85 
13 
13-08 
27 
12-43 
29 
12-83 
14 
13-31 
