100 
LIEUT.-COLQNEL SABINE ON TERRESTRIAL MAGNETISM 
Observations of the Inclination, with Needles whose Poles were reversed, made at 
Garden Island, Sydney, July 1841. 
Date. 
Hour. 
Needle. 
Poles. 
a direct. 
fi reversed. 
Mean. 
Remarks. 
1841. 
July 20. 
20 . 
20 . 
20 . 
20 . 
h m 
9 20 a.m. 
10 45 A.M. 
1 00 P.M. 
2 15 p.m. 
9 00 A.M. 
R 4 
R 10 
R 6 
R 7 
C 1 
C 2 
a —62 52-5 
ft —62 46-5 
a —62 57-5 
ft -62 33-7 
a —62 50-1 
ft —62 58-5 
a —62 53-9 
ft -62 51-9 
a —62 48-2 
ft —62 45-6 
a -62 49-6 
ft -62 40-5 
1 ° ' 
-62 49-5 
| -62 45-6 
j -62 54-3 
J -62 52-9 
j -62 46-9 
j -62 45-1 
-62 49-1 
>Needles belonging to H.M.S. Erebus. 
j> Needles belonging to H.M.S. Terror. 
General Mean. 
Observations of the Inclination, with Needles whose 
Bay of Islands, New Zealand, August 
Poles were reversed, made at the 
to November 1841. 
Date. 
Hour. 
Needle. 
Poles. 
a direct. 
li reversed. 
1841. 
h m 
August 23. 
2 10 P.M. 
R 10 
a —59 46-1 
ft -59 16-9 
23. 
3 10 p.m. 
R 4 
a -59 38-5 
ft -59 27-5 
24. 
8 40 a.m. 
R 4 
a -59 38-4 
ft —59 25-8 
24. 
9 45 a.m. 
R 10 
a -59 53-9 
ft —59 21-3 
24. 
11 00 a.m. 
R 6 
a —59 28-8 
ft —59 34-0 
24. 
1 10 P.M. 
R 7 
a —59 30-3 
ft -59 30-6 
October 5. 
4 00 p.m. 
R 4 
a -59 39-7 
ft -59 27-3 
12. 
7 00 a.m. 
R 4 
a -59 35-2 
ft -59 27-9 
26. 
6 35 a.m. 
R 4 
a —59 35-7 
ft —59 28-1 
26. 
9 35 a.m. 
R 10 
a -59 50-5 
ft —59 26*6 
26. 
10 35 a.m. 
R 6 
a —59 30-1 
ft -59 31-4 
26. 
1 30 p.m. 
R 7 
a —59 32-4 
ft —59 36-2 
August 23. 
9 00 A.M. 
C 1 
a —59 30-0 
ft -59 27-8 
23. 
1 1 30 A.M. 
C 2 
a —59 31-4 
ft -59 22-7 
November 6. 
9 00 A.M. 
C 1 
a —59 32-5 
ft -59 28-1 
6. 
10 30 A.M. 
C 2 
a —59 32-8 
ft -59 20-8 
Mean. 
Remarks. 
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O / 
59 31-5 
59 33-0 
59 32-1 
59 37-4 
59 31*4 
59 30-4 
59 33-5 
59 31-8 
59 31-9 
59 38-5 
59 30-8 
59 34-3 
59 28-9 
59 27-0 
59 30-3 
59 26-8 
>Needles belonging to H.M.S. Erebus. 
-59 31-9 
^.Needles belonging to H.M.S. Terror. 
General Mean. 
