MADE ON THE WESTERN COAST OF AFRICA. 
495 
Table I. 
Date. 
Place. 
Needle 
No. 1. 
Needle 
No. 2. 
Needle 
No. 3. 
Needle 
No. 4. 
Farh. 
Therm. 
Remarks. 
1830, October .... 
Portsmouth. 
m s 
4 57-45 
m 
4 
S 
20-8 
m 
4 
S 
30-2 
in s 
3 37-6 
6°6 
100 Vib ns before sailing. 
1831, August .... 
Portsmouth. 
4 
58-44 
4 
20-05 
4 
32-86 
3 37-22 
70 
100 Vib” s after voyage. 
1830, December 1. . 
Bay of Hann. 
4 
7-7 
3 
41-0 
3 
50-0 
3 2-7 
78 
1 10 Vib“ s after voyage. 
3.. 
Bay of Dacar. 
4 
11-0 
3 
40-3 
3 
50-1 
3 3-3 
78 
110 Vibrations. 
4.. 
Bay of Dacar. 
4 
6-8 
3 
36-33 
3 
50-66 
3 4-13 
78 
110 Vibrations. 
1831, Mar. and Ap. 
Rio Nunez. . 
4 
8-22 
3 
37-06 
3 
47-54 
3 1-55 
82 
110 Vibrations. 
May 
Bathurst. . . . 
4 
10-88 
3 
38-7 
3 
49*55 
3 3-25 
77 
110 Vibrations. 
July 
Cape Blanco. 
3 
59-43 
3 
28-91 
3 
39-43 
2 55-53 
64 
100 Vibrations. 
Table II. 
Place. 
Latitude 
North. 
Longitude 
West. 
Horizontal 
Force. 
Thermo- 
meter. 
Portsmouth 
o / 
50 48 
o / 
1 6 
1-0000 
o 
68 
Cape Blanco 
20 47 
17 4 
1-5423 
64 
Goree 
14 40 
17 25 
1-7081 
78 
Bathurst (river Gambia) . . 
13 8 
16 33 
1-7050 
77 
Rio Nunez 
10 36 
14 42 
1-7362 
82 
November , 1831 
