LIEUT.-COLONEL SABINE ON TERRESTRIAL MAGNETISM. 
165 
Observations of the Inclination, with Needles whose Poles were reversed, made at the 
Magnetic Observatory in Van Diemen Island in 1840, 1841. 
Poles. 
Date. 
Hour. 
Needle. 
<s direct. 
£ reversed. 
Mean. 
Remarks. 
1840. 
h m 
R G 1 
September 12. 
11 00 A.M. 
a —70 32-1 
f3 —70 42-1 
| -70 37-1 ~ 
14. 
1 1 20 A.M. 
R G 2 
a -70 35-6 
fl -70 40-9 
| —70 38-2 
21. 
11 30a.M. 
R 4 
a -70 39-7 
(3 -70 35*5 
| -70 37-6 
21. 
1 30 p.m. 
R 10 
a —70 49*8 
(3 —70 53-7 
1 -70 51-7 
22. 
11 20 a.m. 
R 6 
ex —70 46 - 5 
/3 —70 45-2 
| —70 45-8 
>Needles belonging to H.M.S. Erebus. 
22. 
2 00 p.m. 
R 7 
a -70 46-4 
(3 -70 45-2 
| —70 45-8 
October 5. 
1100 A.M. 
R 6 
a —70 42 - 4 
/3 —70 44-0 
| -70 43-2 
5. 
2 00 p.m. 
R 7 
a _70 43-3 
/3 —70 40*4 
| —70 42-0 
15. 
2 00 p.m. 
D 1 
a -70 31-4 
/3 -71 il-l 
J —70 51-2 
1 Needles belonging to Sir John Frank- 
16. 
11 00 A.M. 
D 2 
ex — 70 08'4 
(3 -71 06-4 
j -70 37-4 
[ LIN. 
19. 
19- 
10 20 A.M. 
11 00 A.M. 
C 1 
C 2 
a —70 42-0 
13 -70 34-5 
a -70 34-3 
(3 -70 41-2 
j -70 38-3 
| -70 37-7 
j> Needles belonging to H.M.S. Terror. 
1841. 
April 14. 
11 20 A.M. 
R 4 
a —70 38-6 
(3 - 70 38-8 
I -70 38-7 ' 
14. 
2 00 p.m. 
R 10 
a -70 46-5 
>3 —70 39-3 
j -70 42-9 
15. 
15. 
10 50 A.M. 
3 30 p.m. 
R 6 
R 7 
a -70 34*7 
(3 -70 43-3 
a _70 40-6 
(3 -70 33-9 
j -70 39-0 
| -70 37*2 
>Needles belonging to H.M.S. Erebus. 
16. 
1 30 p.m. 
R G 1 
a —70 34-4 
(3 -70 38-2 
j -70 36-3 
17- 
11 20 a.m. 
R G 2 
a —70 35-7 
(3 -70 39-0 
| —70 37-3 
24. 
11 00 a.m. 
C 1 
a -70 41-1 
/3 -70 35-0 
j -70 38-0 
24. 
Noon. 
C 1 
a -70 49*3 
f3 -70 37-0 
j -70 43-1 
24. 
2 00 p.m. 
C 2 
ex —70 36-9 
(3 -70 31-9 
j -70 34-4 
>Needles belonging to H.M.S. Terror. 
30. 
Noon. 
C 1 
a -70 31*2 
jS -70 41-7 
| —70 36-4 
30. 
Noon. 
C 2 
a —70 33*0 
/3 -70 46-0 
| —70 39-5 
> 
May 10. 
2 20 p.m. 
R 4 
a. — 70 46 - 6 
(3 -70 39-1 
j -70 42-9 
10. 
4 15 p.m. 
R 10 
a -70 53-9 
(3 -70 34-0 
| —70 43-9 
11. 
10 30 A.M. 
R 4 
a -70 46-2 
l3 -70 38-6 
| -70 42-4 
18 
10 45 a.m. 
R 4 
a — 70 45‘4 
| -70 40-9 
^Needles belonging to H.M.S. Erebus. 
f3 -70 36-3 
18 
2 15 p.m. 
R 10 
a —70 47-1 
(3 —70 33-1 
j _70 40-5 
June 21, 
9 45 a.m. 
R 10 
ex — 70 45*8 
/ 3 -70 35-1 
j -70 40-4 
21. 
10 45 a.m. 
R 4 
a —70 45-1 
(3 -70 36-5 
j —70 40-8 
— 70 40-7 
General Mean. 
z 2 
*■ 
