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 
in s 
4 20-8 
in s 
4 30-2 
m s 
3 37-6 
6°6 
100 Vi!) 1,3 before sailing. 
1831, August .... 
Portsmouth. 
4 58-44 
4 20-05 
4 32-86 
3 37-22 
70 
100 Vib ns after voyage. 
1830, December 1.. 
Bay of Hann. 
4 7-7 
3 41-0 
3 50-0 
3 2-7 
78 
110 Vib ns 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 
