146 
MAJOR SABINE ON TERRESTRIAL MAGNETISM. 
B. 
Mr. Dunlop’s Observations of the Dip and Intensity, made at sea in a voyage from 
England to Australia. 
Date. 
Latitude. 
Longi- 
tude. E. 
Dip. 
Time of 
horizontal 
vibration. 
Intensity. 
London 
= 1-372. 
Date. 
Latitude. 
Longi- 
tude. E. 
Dip. 
Time of 
horizontal 
vibration. 
Intensity. 
London 
= 1-372. 
1831. 
/ 
/ 
O 
/ 
s 
1831. 
O 
/ 
O 
/ 
O 
s 
July 23. 
5 
37 
341 
3 
28 
27 
576-0 
1-01 
Aug. 26. 
-35 
31 
344 
15 
-35 
44 
642-4 
0-88 
24. 
5 
23 
342 
35 
26 
13 
576-6 
1-00 
27. 
-36 
36 
347 
24 
-38 
02 
653-8 
0-88 
25. 
4 
57 
344 
16 
24 
34 
570-6 
1-00 
28. 
-37 
12 
350 
24 
-39 
16 
652-0 
0-90 
26. 
4 
48 
346 
3 
23 
21 
568-8 
1-00 
29. 
-37 
37 
353 
36 
-40 
50 
654-4 
0-91 
27. 
4 
14 
345 
31 
22 
38 
570-7 
0-98 
30. 
-37 
40 
355 
51 
— 41 
51 
658-1 
0-92 
28. 
3 
52 
347 
2 
20 
51 
Not obs. 
31. 
-38 
44 
0 
16 
— 43 
44 
676-2 
0-91 
28. 
3 
36 
347 
53 
20 
5 
569-5 
0-97 
Sept. 1. 
-39 
03 
3 
16 
— 44 
48 
678-2 
0-91 
29- 
3 
18 
349 
16 
19 
37 
568-9 
0-97 
2. 
-39 
45 
4 
40 
-46 
24 
680-0 
0-92 
30. 
2 
37 
347 
40 
19 
44 
565-0 
0-99 
3. 
-39 
10 
6 
20 
-46 
55 
686-1 
0-93 
30. 
2 
27 
347 
20 
19 
14 
Not obs. 
4. 
-39 
00 
10 
12 
-48 
31 
692-0 
0-93 
31. 
1 
53 
346 
20 
18 
35 
569-6 
0-96 
5. 
-39 
07 
14 
0 
-49 
55 
689-4 
0-96 
Aug. 1. 
- 0 
53 
344 
36 
17 
22 
569*6 
0-95 
6. 
-39 
22 
17 
24 
—50 
59 
691-5 
0-98 
2. 
- 1 
52 
342 
31 
14 
40 
571-0 
0-94 
7- 
-39 
06 
20 
00 
-52 
03 
703-1 
0-97 
3. 
— 4 
3 
341 
37 
11 
28 
568-1 
0-93 
8. 
-39 
00 
23 
00 
— 54 
01 
704-4 
1-01 
4. 
- 6 
2 
341 
02 
8 
24 
573-2 
0-91 
9. 
-38 
04 
25 
00 
— 55 
10 
697-7 
1-06 
5. 
- 8 
10 
339 
50 
5 
12 
577-7 
0-89 
11. 
-39 
16 
30 
27 
-58 
11 
712-4 
1-10 
6. 
- 9 
45 
337 
53 
3 
09 
574-9 
0-89 
12. 
-39 
26 
33 
30 
-59 
05 
716-0 
1-12 
7- 
-10 
12 
337 
42 
1 
38 
581-5 
0-87 
13. 
-39 
16 
35 
37 
-60 
01 
731-4 
1-10 
8. 
-12 
51 
336 
10 
0 
35 
577-7 
0-88 
14. 
-37 
30 
37 
27 
-58 
11 
720-1 
1-08 
9- 
-14 
31 
334 
30 
— 1 
05 
583-4 
0-87 
15. 
— 35 
20 
39 
07 
-58 
33 
712-7 
1-11 
10. 
-16 
12 
333 
10 
- 4 
02 
581-0 
0-88 
16. 
-35 
10 
40 
50 
-59 
54 
718-6 
1-14 
11. 
— 18 
09 
332 
48 
- 7 
10 
593-7 
0-84 
17. 
— 35 
54 
43 
16 
-61 
08 
717-6 
1-19 
12. 
-19 
47 
332 
45 
-10 
13 
591-1 
0-86 
19. 
-35 
01 
48 
06 
-60 
27 
711-1 
1-18 
13. 
-21 
08 
333 
04 
-12 
12 
594-7 
0-85 
21. 
-36 
18 
52 
48 
— 62 
46 
712-4 
1-27 
14. 
—23 
06 
334 
39 
— 15 
12 
603-0 
0-84 
22. 
-37 
07 
55 
20 
-63 
13 
719-7 
1-27 
15. 
-25 
02 
336 
50 
-17 
45 
611-9 
0-83 
23. 
-37 
40 
59 
15 
-63 
54 
721-8 
1-29 
16. 
— 26 
12 
339 
12 
-19 
50 
608-2 
0-85 
24. 
-37 
46 
63 
38 
-63 
51 
723-0 
1-28 
17- 
-25 
56 
340 
34 
— 22 
01 
623-0 
0-82 
25. 
-37 
50 
66 
04 
-64 
10 
719-2 
1-31 
18. 
—27 
02 
339 
15 
— 23 
46 
629-0 
0-81 
26. 
— 38 
15 
69 
31 
65 
04 
713-1 
1-38 
19. 
07 
51 
337 
51 
—24 
57 
628-5 
0-82 
27. 
-39 
31 
74 
00 
— 65 
02 
713-8 
1-37 
20. 
-29 
06 
337 
17 
— 26 
20 
619-8 
0-86 
29. 
-39 
27 
81 
00 
-66 
07 
Not obs. 
21. 
-29 
30 
336 
40 
-26 
02 
619-1 
0-86 
Oct. 2. 
-40 
12 
91 
14 
-67 
26 
703-6 
1-55 
22. 
-30 
18 
337 
05 
-27 
11 
621-0 
0-86 
4. 
-41 
02 
99 
29 
-68 
02 
699-6 
1-61 
23. 
— 30 
47 
337 
26 
-28 
05 
621-4 
0-87 
5. 
— 41 
18 
103 
53 
-68 
15 
698-3 
1-63 
24 , 
-32 
01 
338 
08 
— 30 
13 
623-0 
0-88 
10. 
42 
32 
122 
36 
-70 
19 
711-4 
1-73 
25. 
-33 
39 
341 
00 
-32 
46 
628-2 
0-89 
C. 
The observations of Commander Edward Barnett, R.N., were made with a dipping 
instrument, the construction of which was favourably spoken of by S. H. Christie, 
Esq., in a paper read before the Royal Society in April 1833, as noticed in Commander 
Barnett’s report. The needle having been used for the intensity as well as for the 
dip, the dip results are derived from observations in four positions only of the instru- 
ment, the poles of the needle not being changed in the course of each observation. 
