Magnetic Declination. 
227 
TABLE VI. — Diurnal Range of Magnetic Declination fox* each Civil Day, as deduced from the Nine 
Daily Observations, with the Mean for each "Week and for each Month in 1843. 
Civil 
Day. 
January. 
February. 
March. 
April. 
Mav. 
. 1 IX \ , 
June. 
July. 
August. 
September 
October. 
IVovf ml xT 
JJeccm ber. 
1 
1 
r... .1 
O - 1 J 
1 1 .0=; 
; 
1 n.54 
1 ^.4 1 
1 7.3R 
1 1 .00 
1 4. 90 
TO 3 51 
0 90 
1 1-80 
o 
4 84 
4.05 
l~1 9 781 
1 4.88 
Tl 3.031 
1 1 0 y o 1 
91 .77 
fi Ol 
D-y 1 
Q 1 7 
9-37 
o 
o 
7.97 
3.47 
4.50 
1 5.84 
U'OO 
X / 'KJO 
15-03 
12-62 
n 4.75I 
1 9.70 
19 71 
[fa-/ 1] 
A 
3.54 
0.77 
y- / / 
1 9. 1 8 
1 9 93 
8.07 
0 -y / 
1 Q. 1 0 
1 3.98 
o on 
^ fi ^ 
0-oD 
4-06 
O 
9.38 
Tl 2-701 
\_l £ / yj 
[10-38] 
19-49 
7.75 
7-84 
7.16 
1 1-89 
91 .48 
T7.Q41 
o-Za 
o 
^ fin 
40.03 
1 5.14 
33-38 
95. 5n 
8.80 
Tl 3.301 
1 3.9Q 
1 0 ^y 
Q 77 
y- 1 1 
0 90 
y- Jy 
fa-43 
*7 
i 
3.04 
Q.70 
y / u 
91 .s*; 
1 3.78 
It)' / o 
l"1 9.851 
8. 1 7 
y ^tu 
y Ut; 
I 7. OR 
4 fi=; 
O-OO 
Q 
O 
T4.391 
6-93 
5-72 
14-37 
7.87 
7.73 
/ / 0 
10-56 
13-47 
1 1-02 
T0.441 
7.17 
io-yi 
Q 
D 'yJU 
8.77 
5-35 
Tl 5.701 
0. 1 8 
y • 1 0 
9-04 
TQ.81 1 
i_y ° j 
18-02 
1 fi.44. 
s.n7 
O'U / 
5 87 
i n 
5.31 
5.1 0 
7. 97 
/ -y / 
1 9.55 
1 fi.90 
14-32 
10-01 
n 9.1 3i 
3.55 
3.9A 
n 9 7QT 
1 1 
1 1 
5.8 1 
O'O L 
1 9.07 
X £t'\J / 
1 3.3fi 
Tl 0.771 
1 0-95 
1 9.0fi 
13.17 
5 49 
1 / -oy 
1 9 
4.41 
T 1 0-791 
1 1-33 
1 9.fi8 
8-64 
7-92 
15-51 
8.75 
0 1 0 
8.R 1 
O'O 1 
rfi.55i 
1 q no 
1 o 
5 09 
99.54 
0.49 
1 0.99 
O'OO 
1 3.79 
1 2-35 
lit uy 
r 1 1 .fi n 
Ll 1-0.1 J 
1 3 74 
Q.R3 
y-uo 
Q.5H 
y-ou 
y-ay 
t A. 
4 30 
11.18 
1 1 .90 
ro. 1 71 
0.3 1 
y -o i 
0-55 
1 3.03 
1 n 34 
iu-ys 
7 7Q 
0-zO 
1 O 
T5.5Q1 
8-18 
6-34 
13-43 
1 3.97 
9-39 
1 1-70 
10-98 
0.01 
y ui 
n 0.4 11 
7.50 
3 no 
Q.4.9 
y ^t^i 
1 5.95 
8-67 
[10-87] 
8.85 
9-25 
T10-771 
7. 1 0 
/ • 1 y 
8.07 
1 4.07 
9 07 
z-y / 
17 
4-87 
4-57 
7-82 
11-36 
7-23 
9-43 
10-26 
10-56 
[13-06] 
6-91 
4-64 
[4-52] 
18 
5-45 
5-69 
21-56 
8-38 
9-87 
[9-70] 
10-87 
8-27 
21-83 
11-39 
4-00 
5-13 
19 
6-51 
[7-23] 
[12-47] 
10-55 
9-32 
7-00 
9-91 
11-77 
15-92 
8-84 
[4-70] 
3-9S 
20 
4-85 
4-78 
14-19 
10-22 
8-17 
11-70 
8-98 
[10-83] 
13-18 
7-97 
3-09 
5-67 
21 
5-81 
6-59 
7-80 
10-38 
[9-51] 
11-45 
10-00 
10-28 
17-99 
4-27 
6-67 
12-33 
22 
[6-75] 
6-48 
14-80 
5-30 
7-31 
11-61 
14-27 
12-86 
[6-96] 
3-79 
3-19 
23 
9-25 
619 
8-69 
[9-26] 
9-35 
[16-04] 
9-85 
11-03 
5-92 
5-45 
3-36 
24 
6-86 
23-44 
8-29 
9-82 
13-05 
13-98 
32-85 
8-77 
[12-72] 
8-74 
4-87 
[5-84] 
25 
7-22 
12-30 
8-61 
10-05 
15-02 
[14-34] 
17-92 
10-76 
9-89 
6-00 
2-82 
4-61 
26 
6-32 
[9-68] 
[11-47] 
9-80 
16-33 
16-49 
14-88 
11-83 
15-57 
25-14 
[4-04] 
5-29 
27 
4-98 
3-81 
8-36 
12-13 
13-57 
13-79 
12-95 
[11-09] 
8-98 
6-06 
2-68 
6-27 
28 
11-85 
8-74 
19-12 
12-02 
[13-25] 
13-12 
11-84 
10-17 
11-04 
5-1S 
4-10 
8-18 
29 
[5-93] 
25-78 
11-74 
15-17 
8-76 
14-86 
12-87 
9-30 
[11-77] 
4-31 
8-49 
30 
5-85 
9-22 
[10-65] 
9-16 
25-60 
[12-29] 
12-12 
7-07 
9-60 
3-38 
5-99 
31 
3-40 
8-92 
10-27 
11-14 
13-99 
15-43 
[7-92] 
Mean 
5-66 J 
10-09 
10-12 
12-3S 
11-00 
12-13 
12-30 
11-78 
12-67 
9-65 
5-85 
7-63 
Monthly Means of the Diurnal Ranges. 
The means of the diurnal ranges for January, November, and December, do not differ much from each 
other, but they differ considerably from the means for the remaining nine months, which differ little from each 
other. The means for the four seasons are : — 
Winter; January, November, and December, mean of diurnal ranges, . = 6-38 
Spring; February, March, and April, . =10-86 
Summer; May, June, and July, . =11-81 
Autumn; August, September, and October, . =11-37 
The Year, =10-10 
The quantities in Table VI. shew that the monthly means are much affected by irregular disturbing 
causes, and that if some of the lai-ger diurnal ranges were removed, the monthly means would differ little from 
the ranges of the monthly means of the diurnal variations. It is obvious that the means of the diurnal ranges 
only differ from the diurnal ranges of the means in that the minimum or maximum of certain days does not oc- 
