200 
GENERAL SIR EDWARD SABINE ON TERRESTRIAL MAGNETISM. 
NORTH EQUATORIAL ZONE IV.— Lat. 30° N. to 40° N. (continued). 
Stations. 
Lat. N. 
Long. E. 
Date. 
Declination. 
Inclination. 
Force in 
British units. 
Observers. 
Ob- 
served. 
Correction 
to Epoch 
1842-5. 
Corrected. 
Ob- 
served 
Cor. to 
Epoch 
1842-5. 
Corrected. 
o , 
o ' 
o 
O f 
o 
Tembleque 
1 39 42 
356 30 
1842 
21 46 w. 
21-8 w. 
61 01 
610 N. 
9 67 
Lamont. 
G-ranada 
37 10 
356 33 
1842 
21 26 w. 
21-4 w. 
58 40 
58-7 n. 
9-50 
Lamont. 
At sea 
35 48 
357 00 
1842 
18 30 w. 
18-5 w. 
Berard. 
Almeria 
36 52 
357 29 
1842 
20 57 w. 
2 10 w. 
58 07 
58-1 n. 
9-46 
Lamont. 
At sea 
36 15 
357 34 
1858 
19 23 w. 
19-4 w. 
Novara. 
At sea (2 observations) 
35 52 
357 41 
1842 
18 40 w. 
18 7 w. 
Berard. 
At sea (2 observations) 
37 43 
358 06 
1846 
19 41 w. 
19-7 w. 
Berard. 
At sea 
i 36 46 
358 52 
1838 
19 47 w. 
19 8 w. 
Berard. 
Cartagena 
37 36 
358 58 
1842 
20 29 w. 
20-5 w. 
58 22 
58-4 n. 
9-44 
Lamont. 
At sea (3 observations) 
36 21 
359 06 
1846 
18 58 w. 
19-0 w. 
Berard. 
Valencia 
39 29 
359 35 
1842 
20 32 w. 
20-5 w. 
60 08 
60-1 n. 
9-60 
Lamont. 
At sea (2 observations) 
36 10 
359 42 
1846 
19 18 w. 
19-3 w. 
Berard. 
A few observations are subjoined which should have been included in Zone I. 
Stations. 
Lat. N. 
Long. E. 
Date. 
Declination. 
Inclination. 
Force in 
British units. 
Observers. 
Ob- 
served. 
Correction 
to Epoch 
1842-5. 
Corrected. 
Ob- 
served. 
Cor. to 
Epoch 
1842-5.' 
Corrected. 
o / 
o ) 
o / 
o 
r 
1841 
2 33 n. 
2-6 n.1 ° 
Fishbourne. 
Mean Point; 
4 18 
6 05 • 
1841 
2 29 n. 
2-5 n. L 2-5 n. 
Fishbourne. 
1841 
2 30 n. 
2-5 n. J 
Fishbourne. 
Eboe .... 
5 40 
6 27 
1841 
4 46 n. 
4-8 n. 
Fishbourne. 
Cliff of Idda . . . 
7 04 
7 00 
1841 
7 45 n. 
7'8 n. 
Fishbourne. 
Fernando Po 
3 45 
8 45 
1841 
2 14 s. 
2-2 s. 
Fishbourne. 
Stioura, Peono 
8 30 
346 44 
1841 
26 30 n. 
26 5 n. 
Fishbourne. 
Liberia 
6 25 
349 30 
1841 
22 57 n. 
230 n. 
Fishbourne. 
Grunyille .... 
1841 
19 02 n. 
19 0 n. 
Fishbourne. 
5 00 
351 00 
1841 
18 58 n. 
19-0 n. 
Fishbourne. 
Cape Coast Castle 
5 06 
358 46 
1841 
11 26 n. 
11-4 N. 
Fishbourne. 
Accra 
5 32 
359 49 
1841 
11 24 n. 
11-4 N.' 
Fishbourne. 
In the following Tables I have placed in comparison with each other, the values of 
the magnetic Elements at every fifth degree of latitude between 40° N. and the Equator, 
and at every tenth degree of longitude between 0° and 360°, as shown (1) in the Table 
published by MM. Gauss and Weber, in the ‘Atlas des Erdmagnetismus ’ (Leipsic, 
1840), and (2) in the Tables and Maps of the present paper. For the values of the 
Magnetic Force, which in the Atlas of MM. Gauss and Weber are expressed in the 
Arbitrary Scale, of which the fundamental value is T372, or (as written by M. Gauss) 
1372 = the Force in London in 1836, I have substituted the Absolute Values corre- 
sponding to 10-28 as the Absolute Force in London at the same Epoch, in the scale 
which was originally adopted in conformity with the Report of the Committee of 
Physics of the Royal Society, 1840, page 21. In all the three Elements there are some 
blanks in the columns derived from the data in the present paper, owing to observations 
being either wanting or insufficient in those localities. 
