LIEUT.- COLON EL SABINE ON TERRESTRIAL MAGNETISM. 
115 
Islands, and on the ice in lat. —65° 47', long. 202° 08'. I have also, in the case of the 
Terror, availed myself of a comparison of the weights and deflectors made on the 
3rd, 4th and 5th of December 1841, at sea, when the weather was extremely favour- 
able, and the ship did not materially change her position. From the observations 
on these days we have as follows : — 
December 
Intensity 
deduced 
by weights. 
Angles of deflection by 
1841. 
Def. N. 
Def. S. 
Mag. N. 
Mag. N S. 
3 A.M. 
1-783 
36 
55-9 
34 06-7 
30 44-1 
40 52-8 
3 P.M. 
1-778 
36 
51-6 
34 06-3 
30 46-1 
40 45'8 
4 
1-773 ; 
36 
r 4i-8 
l 44-7 
34 22-0 
30 48-7 
40 56-3 
5 
1-779 
36 
18-3 
34 29-4 
30 46-1 
40 54-9 
Mean . . 
1-778 
36 
42-5 
34 16-0 
30 46-2 
40 52-5 
The several comparisons from which the equivalent weights are derived, together 
with the weights so derived, are collected in the following Table. 
Inten- 
sity de- 
duced by 
weights. 
Angles of deflections by 
Equivalent weights. 
Station. 
Date. 
Deflector 
N. 
Deflector 
S. 
Magnet 
N. 
Magnets 
NS. 
Deflector 
N. 
Deflector 
S. 
Magnet 1 Magnets 
N. | N s: 
Hobarton .... 
April 1841 . . 
1-820 
o 
36 
00-6 
O 
33 
23-0 
O 
30 
14-0 
O 
40 
05-5 
1 grs. 
2-793 
grs. 
2-613 
grs. 
2-391 
grs. 
3-059 
Sydney 
July 1841 . . 
1-699 
38 
05-9 35 
15-7 
31 
47-2 
41 
45-3 
2-736 
2-560 
2-336 
2-953 
New Zealand . . 
Aug. and Oct. 
1841 .... 
j 1.608 
39 
36-8 
36 
57-8 
32 
50-8 
42 
58-4 
2-675 
2-525 
2-276 
2-861 
At Sea 
Dec.3,4and5 ; 
1841 
1 1778 
36 
42-5 
34 
16-0 
30 
46-2 
40 
52-5 
2-773 
2-613 
2-374 
3-036 
On Ice 
Jan. 16, 1842 
1-949 
33 
47-6 31 
16-1 
28 
52-7 38 
45-7 
2-829 
2-640 
2-456 
3-184 
Falkland Islands 
April, July and 
Aug. 1842 
| 1-336 
44 
38-2 41 
57-1 
35 
59-0 46 
14-0 
2-442 
2-324 
2-042 
2-510 
The equivalent weights for each deflector, and for each half degree of deflection, 
have been obtained in the manner already described, for the angles of deflection and 
equivalent weights in the preceding Table, and are subjoined ; by their aid the in- 
tensities 1' entered in the general table of observations have been computed by the 
formula 
I ? = -3832o/ cosec v'. 
Def. 
N. 
Def. S. 
Magnet N. 
Magnets NS. 
V 
w f . 
f 
ll/. 
u /. 
v\ 
w'. 
V 
w'. 
V 
w'. 
V 
w 
i 
I w'. 
/ 
grs. 
1 
o 
/ 
grs. 
/ 
grs. 
o 
/ 
grs. 
0 
grs. 
0 
grs. 
0 
/ 
grs. 
O 
grs. 
33 
00 
2-840 
39 
30 
2-682 
31 
00 
2-644 
,37 
30 
2-504 
28 
00 
2-482 
34 
30 
2-166 
37 
00 
3-268 
43 
30 
2-816 
33 
30 
2-834 
40 
00 
2-660 
31 
30 
2-639 
38 
00 
2-485 
28 
30 
2-464 
35 
00 
2-126 
37 
30 
3-240 
44 
00 
2-766 
34 
00 
2-826 
40 
30 
2-638 
32 
00 
2-634 
■38 
30 
2-464 
29 
00 
2-446 
35 
30 
2-085 
38 
00 
3-210 
44 
30 
2-714 
34 
30 
2-817 
41 
00 
2-615 
32 
30 
2-627 
'39 
00 
2-444 
29 
30 
2-426 
36 
00 
2-040 
38 
30 
3-180 
45 
00 
2-660 
35 
00 
2-809 
41 
30 
2-593 
33 
00 
2-619 
39 
30 
2-423, 
30 
00 
2-406 
39 
00 
3-148 
45 
30 
2-604 
35 
30 
2-800 
'42 
00 
2-571 
33 
30 
2-611 
40 
00 
2-403 
30 
30 
2-387 
39 
30 
3-114 
46 
00 
2-544 
36 
00 
2-790 
42 
30 
2-548 
34 
00 
2-602 
40 
30 
2-382 
31 
00 
2-367j 
40 
00 
3-081 
46 
30 
2-460 
36 
30 
2-777 
43 
00 
2-524 
34 
30 
2-591 
41 
00 
2-361 
31 
30 
2-346 
40 
30 
3-040 
37 
00 
2-765 
43 
30 
2-488 
35 
00 
2-580 
41 
30 
2-341 
32 
00 
2-323' 
41 
00 
3-016 
37 
30 
2-753 
44 
00 
2-473 
35 
30 
2-567 
42 
00 
2-321 
32 
30 
2-297 
41 
30 
2-981 
38 
00 
2-738 
44 
30 
2-448 
36 
00 
2-554 
33 
00 
2-268 
42 
00 
2-944 
38 
30 
2-721 
,45 
00 
2-423 
36 
30 
2-538 
33 
30 
2-236 
42 
30 
2-905 
39 
00 
2-702 
1 
37 
00 
2-523 
34 
00 
2-203 
43 
00 i 
2-863 
