6 
MAJOE-GEKEEAL SAEIKE OX THE DECEXXIAL 
Table III. Hobarton Declination. 
Years. 
Mean scale reading at 
Differences. — 5 
P.M. — 6 A.M. 
2 P.M. 
6 A.M. 
Scale-divisions. 
Ajc. ' 
1841 
61-5 
53-6 
7-9 
5'6l ! 
1842 
83*3 
75-9 
7-4 
5-25 
1843 
83-8 
76-4 
7-4 
5-25 
1844 
81-6 
74.4 
7-2 
5*11 
1845 
85-0 
76-5 
8*5 
6-03 
1846 
87-1 
79*2 
7-9 
5*6l I 
1847 
90-0 
79-7 
10-3 
7-31 
1848 
91-5 
80-3 
11-2 
7*95 
1849 
91-8 
81-6 
10-2 
7-24 
1850 
91*1 
82 '3 
8-8 
6-25 
1851 
90-7 
81-9 
8-8 
6‘25 i 
1852 
90*3 
80-7 
9-6 
6-82 
1853 
81-5 
74-0 
7-3 
5-32 
1854 
76-8 
68-4 
8-4 
5-96 
This Table affords a striking illustration of the systematic character of the decennial 
inequality ; and with the evidence previously adduced in reference to the mean dimnal 
effect of the greater magnetic distm’bances in different years, shows that in both classes 
of solar-diurnal variation, (the daily and constant, and that due to distm’bances of occa- 
sional occurrence,) the decennial inequality is as distinctly and decidedly marked in the 
Hobarton observations as it has been found to be elsewhere. 
Lunar-diurnal Variation . — Table IV. exhibits the lunar-dim’nal variation in the four 
periods, each of two years’ duration, obtained from the 51,995 observations remaining 
after the separation of the disturbances of large amount, rearranged according to limar 
hours and treated in the manner described in the Philosophical Transactions for 1856, 
Art. XXII. The sign + signifies Easterly, and the sign — Westerly deflections fr’om the 
normal direction. 
Table IV. 
One scale-division =0'’7I. 
Lunar 
hours. 
1841 
and 
1842. 
1843 
and 
1844. 
1845 
and 
1846. 
1847 
and 
1848. 
Lunar 
hours. 
1841 
and 
1842. 
1843 
and 
1844. 
1845 
and 
1846. 
1847 
and 
1848. 
Sc. div. 
Sc. div. 
Sc. div. 
Sc. div. 
Sc. div. 
Sc. div. 
Sc. div. 
Sc. div. 
0 
+ 0-14 
+ 0-18 
-|-0'12 
-I-0-27 
12 
4- 0*14 
-1-0-15 
-f 0-16 
4-0*02 
1 
-1-0-08 
+ 0-24 
+ 0-14 
-hO-24 
13 
-fO-26 
+ 0-27 
4-0*25 
-1-0*15 
2 
+ 0-07 
4-0’16 
+ 0-25 
+ 0-23 
14 
+ 0-19 
+ 0-28 
-f 0*25 
- 40*09 
3 
—0-06 
+ 0-21 
-I- 0*28 
+ 0-10 
15 
+ 0*13 
+ 0-22 
4-0*14 
— 0*02 
4 
— 0-12 
+ 0-13 
+ 0-26 
+ 0*08 
16 
+ 0-09 
+ 0-14 
-f 0*05 
— 0*01 
5 
-0-14 
-0-09 
-l-O-ll 
-0-09 
17 
-I-0-08 
— 0-08 
-0*09 
-0*10 
6 
- 0-27 
-0-14 
-0-04 
-0-13 
18 
— 0-14 
— 0-17 
- 0*19 
-0*15 
7 
— 0-20 
— 0-22 
-0-04 
— 0-18 
19 
— 0-13 
— 0-25 
-0*30 
— 0*26 
8 
- 0*16 
-0-25 
-0*13 
-0-06 
20 
-0'12 
-0-27 
-0*40 
-0*15 
9 
-0“06 
-0-09 
-0-09 
-0-06 
21 
-0-03 
— 0-23 
— 0*30 
— 0*15 
10 
-0-04 
— 0*03 
-0-06 
+ 0*01 
22 
-t-0-02 
— 0-01 
— 0*24 
+ 0*09 
11 
-0-01 
+ 0-11 
+ 0-07 
+ 0-08 
23 
-I-0-08 
-f 0-03 
— 0*05 
4-0*18 
