504 
GENERAL SIE EDWARD SABINE ON TEEEESTEIAL MAGNETISM. 
SOUTH EQUATORIAL ZONE IV.— Lat. 30° to 40° S. (continued). 
Declination. 
Inclination. 
! Force in British units. 
Stations. 
Lat. S. 
Long. E. 
Date. 
Ob- 
served. 
Correction 
to Epoch 
18425. 
Corrected. 
Ob- 
served. 
Cor. to 
Epoch 
1842-5. 
Corrected. 
Ob- 
served. 
Cor. to 
Epoch 
1842-5. 
Corrected. 
Obijrers. 
At sea 
At sea 
o ' 
38 23 
31 28 
359 37 
359 38 
1847 
1840 
O 1 
22 28 w. 
23 41 w. 
O 1 
0 18 E. 
0 10 w. 
22- 2 w. 
23- 9 w. 
o / 
° 
Stanle; 
— 
I 
At sea (3 observations) 
33 25 
359 40 
1842 
43 53 s. 
43-9 s. 
6-63 
6-63 
h.m’.s 
|«V : 
At sea 
31 19 
359 40 
1840 
23 08 w. 
0 10 w. 
23-3 w. 
Ross. 
At sea 
30 37 
359 48 
1840 
23 23 w. 
0 10 w. 
23-5 w. 
Ross. 
At sea 
31 15 
359 48 
1840 
6-56 
6-56 
Terror 
At sea (4 observations) 
30 20 
359 50 
1840 
6-57 
657 
Ross. 
At sea 
30 10 
359 53 
1840 
6-39 
6-39 
Terror] 
At sea (2 observations) 
31 19 
359 53 
1840 
6-56 
6-56 
Ross, j 
At sea 
30 12 
359 54 
1840 
6-56 
6-56 
Terroi 
If* s 
Si B 
A :■'& Ml 
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 the Equator and 40° S., 
and at every tenth degree of longitude between 0° and 360°, as shown (I) 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 F372, or (as written by M. Gauss) 1372 = the 
Force in London in 1836, I have substituted the Absolute Values corresponding 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. 
|fe I 91 i 
|L I91(i: 
■ fe 19 db 
' 
l« 11001] 
5s 10 13t 
ilOSOt 
