LIEUT.-COLONEL SABINE ON TERRESTRIAL MAGNETISM. 
169 
assist in computing the angles corresponding to the weights of 4, 5, and 6 grains, 
which were not commenced with so soon. The observations with the weights on the 
days above stated, when the weights and deflecting magnets were employed in com- 
parison, are collected in one view and given in the subjoined Table, in which are also 
shown the angles of deflection produced by the deflecting magnets on the same occa- 
sions. 
Weights. 
, 
Angles of deflection by 
1840. 
Longitude. 
s s 
J§ 
Intensity 
deduced. 
Latitude. 
Grains. 
Angles of 
Deflector S. 
Deflector N. 
Deflectors 
deflection. 
N and S. 
o / 
o / 
_i_ 
O / 
2 41-4 
52 
i 
5 22-7 
H 
8 14-6 
Sept. 18. 
Hobarton. 
— 42 52 1 147 24 
< 
2 
3 
10 49-6 
16 15 
>1-820 
50 01 
Notobserved 
Notobserved. 
4 
22 06 
5 
28 03*5 
[6 
34 21 
r i 
5 18-4 
52 
1-844 
Nov. 24. 
Auckland Island. 
-50 33 1 166 19 
< 
H 
2 
8 02*2 
10 36-8 
1-867 
1-856 
>1-852 
49 29 
46 50-2 
Notobserved. 
3 
15 58-3 
1-851 j 
' 
r 2 
10 12-1 
52 
1-9301 
Dec. 14. 
Campbell Island. 
3 
15 30-2 
1-906 
49 20-5 
46 10-5 
Notobserved. 
r 
-52 44 
169 10 
< 
1 
4 59-2 
1-963 
'>1-927 
15* N 
2 
10 12-6 
1-929 
49 17 
46 45-7 
Notobserved. 
L 
3 
15 30-2 
1-906 
1841. 
Jan. 8. 
On 
-68 28 
ice. 
176 32 
[3 
16 
14 34-3 
30 38-7 
42 
2-024] 
2-015 
2-017 
47 16 
44 17 
2°1 55 
f2 
9 15-6 
2-1247] 
Feb. 8. 
-77 47 
187 18 
3 
14 14-6 
32 
2-071 
47 03 
44 23 
22 03 
16 
f2 
30 30-9 
9 31 
2-023 
2-067 
>2-053 
Feb. 10. 
-77 39 
187 06 
3 
14 37 
2-019 
46 55-5 
44 14 
21 55-9 
6 
30 34*7 
2-019 
f 2 
9 39 
34 
2-040"" 
3 
14 13 
2-074 
Mar. 22. 
— 63 09 
139 28 
< 
3 
14 18-6 
2-062 
V2-041 
46 54 
44 22 
22 00 
4 
19 34-1 
2-045 
5 
25 11-2 
2-0 12j 
r 2 
9 26-2 
40 
2-086" 1 
3 
14 07-7 
2-086 
April 1 . 
-58 13 
135 18 
< 
4 
19 39-7 
2-035 
|>2-037 
46 55 
44 41 
22 30 
5 
25 28-5 
1-990 
6 
31 08-5 
1-987^ 
fl 
5 14-2 
58 
1-870"" 
2 
10 37-2 
1-885 
April 6. 
-43 41 
146 03 
< 
3 
4 
15 59-4 
21 21 
1-850 
1-881 
>1-885 
50 01 
46 40 
23 17 
5 
26 29-7 
1-919 
6 
32 58-5 
1-887 J 
With the angles of deflection at Hobarton produced by the weights 1, 1|, 2 
and 3 grains, we obtain the equivalent weight 8T5 grains to the angle v = 50° 01' 
of deflector S at the same station ; and thence the value of the constant — 
1 sin v 
= 5-84 
