MAGNETICAL OBSERVATIONS. 
741 
VARIATION of the COMPASS observed on shore. 
Date. 
Place. 
Variation. 
E. 
Instrument 
used. 
Observer 
Date. 
Place. 
Variation. 
E. 
Instrument 
used. 
Observer 
1827. 
Macao . . • 
0 ' " 
2 48 35 
1 15 10 
1 50 10 
No. 2. 
No. 1. 
B. 
1827. 
Loo Choo . . ^ 
0 ' " 
0 56 45 
0 50 40 
Kater’s. 
Theod. 
Bb 
Port Lloyd . .J 
1 00 52 
1 35 10 
0 49 38 
Theod. 
No. 2’. 
B. 
... 
Mean 
1 57 58 
0 33 27 
West. 
Theod. 
1827. 
Loo Choo . . - 
Mean 
1 8 33 
U oZ oU 
0 39 05 
0 52 53 
No. 2. 
Theod. 
... 
Mean 
0 41 29 
As the accuracy of the preceding observations depend upon the 
correct position of the plate, I subjoin some observations that were made 
to determine this point at Kotzebue Sound, where, from the amount of 
the dip, the errors, if any, would naturally be increased. 
KOTZEBUE SOUND, 1826. Dip 77“ 39’ N. 
Plate as it was fixed by observations at Spithead. 
Variation E. 
Variation E. 
Ship’s Head. 
Plate 
Plate 
Ship’s Head. 
Plate 
Plate 
attached. 
unattached. 
attached. 
unattached. 
North. 
31 
17 
31 
17 
South. 
31 
17 
31 
57 
N. 10 E. 
31 
17 
33 
17 
S. 10 W. 
31 
47 
32 
27 
N. 20 E. 
31 
17 
34 
37 
S. 20 W. 
32 
17 
27 
07 
N. 30 E. 
30 
57 
35 
37 
S. 30 W. 
33 
07 
26 
37 
N. 40 E. 
31 
17 
37 
47 
S. 40 W. 
32 
57 
23 
57 
N. 50 E. 
30 
47 
39 
27 
S. 50 W. 
32 
57 
22 
17 
N. 60 E. 
29 
17 
38 
37 
S. 60 W. 
32 
37 
20 
37 
N. 70 E. 
29 
37 
41 
17 
s. 70 w. 
31 
37 
20 
07 
N. 80 E. 
31 
57 
44 
37 
S. 80 W. 
31 
57 
18 
17 
East. 
. . 
. 
• 
West. 
31 
57 
17 
57 
S. 80 E. 
31 
57 
44 
37 
N. 80 W. 
31 
17 
17 
57 
S. 70 E. 
31 
27 
42 
57 
N. 70'W. 
. 
. 
S. 60 E. 
31 
57 
42 
07 
N. 60 W. 
30 
17 
20 
07 
S. 50 E. 
31 
17 
40 
57 
N. 50 W. 
30 
17 
20 
57 
S. 40 E. 
30 
07 
38 
27 
N. 40 W. 
30 
57 
24 
17 
S. 30 E. 
31 
27 
38 
27 
N. 30 W. 
29 
37 
25 
17 
S. 20 E. 
31 
17 
33 
37 
N. 20 W. 
32 
37 
27 
17 
S. 10 E. 
30 
57 
31 
17 
N. 10 W. 
31 
57 
29 
37 
Mean 
31 
04 
38 
11 
Mean W. 
Mean E. 
31 
31 
44 
04 
23 
38 
56 
11 
Mean variation 
31 
24 
31 
04 
Variation from numerous observations on shore 30 57 OIe. 
