108 
LIEUT.-COLONEL SABINE ON TERRESTRIAL MAGNETISM 
Taking T82 as the provisional value of the intensity at Hobarton (Phil. Trans. 
1843, Part II. p. 186) # , vve have its value at Sydney, by the needles of the two ships, 
as follows : — 
Erebus. Terror. 
grs. 
Face East. Face West. 
grs. 
Face East. 
Face West. 
2 
1-703 
1-662 
1 
1-691 
1-674 
3 
1-687 
1-667 
H 
1-685 
1-712 
4 
1-683 
1-680 
2 
1-708 
1*705 
5 
1-680 
1-704 
Ol 
1-692 
1-709 
6 
1-698 
1-688 
3 
1-709 
1-715 
1-690 
1-680 
Ql 
^2 
1-703 
1-687 
1-685 
1-698 
1-700 
1-699 
At the Bay of Islands in New Zealand, in August and October 1841, the deflections 
were as follows : — 
Erebus. 
August. October. 
Deflection. 
Ther. 
Deflection. 
Ther. 
Deflection. 
Ther. 
Deflection. 
Ther. 
grs. 
O 
1 
O 
O 
/ 
O 
O 
1 
O 
O 
1 
O 
[2 
14 
59-3 
59 
'15 
23'3 
60 
'14 
43-2 
68 
'15 
ll'l 
64 
4-3 
c n 
3 
22 
47'5 
59 
4-5 
c n 
(D 
23 
17’9 
59 
4-3 
m 
cd 
22 
45-0 
70 
4-3 
m 
<D 
23 
17'2 
64 
^ < 
CD 
4 
30 
55-0 
59 
<D 
30 
26-9 
59 
wJ 
CD 
30 
306 
70 
QD 
31 
29-2 
65 
CD 
a 
5 
40 
10-5 
58 
CD 
cS 
Ph 
40 
52-0 
60 
CD 
39 
59*3 
70 
CD 
o3 
Ph 
40 
51-0 
65 
.6 
50 
38-1 
58 
.51 
26-0 
61 
-50 
00 
01 
6 
71 
-51 
38*7 
65 
Terror. 
August. October. 
Deflection. 
Ther. 
Deflection. 
Ther. 
Deflection. 
Ther. 
Deflection. 
Ther. 
grs. 
O 
1 
O 
- 0 
/ 
O 
O 
/ 
O 
0 
/ 
O 
'1 
14 
03-2 
59 
13 
24-3 
59 
13 
51-7 
64 
"13 
26-8 
64 
H 
21 
17‘9 
59 
4-3 
G/3 
20 
30-5 
59 
4-3 
C/2 
20 
53-0 
64 
4*3 
C 11 
20 
16-4 
64 
2 
28 
221 
59 
CD 
2 7 
46'9 
59 
c£ 
28 
22-4 
64 
<D 
^ \ 
27 
38-8 
64 
91 
36 
50-7 
59 
CD 
O 
35 
430 
59 
CD 
CD 
cd 
37 
05-6 
64 
CD 
CD 
35 
45-1 
64 
3 
44 
58-3 
59 
44 
38-7 
59 
45 
02-2 
64 
£ 
44 
47.7 
64 
31 
L <0 2 
55 
09-9 
59 
-55 
23 *7 
59 
.55 
19-1 
64 
-55 
26*4 
64 
whence we have the intensity at the Bay of Islands, by the needles of the two ships, 
as follows 
* 1’82 + e being the true value, in which e is a small correction to be determined hereafter, applicable to the 
whole series of observations depending on Hobarton as a primary station. 
