LIEUT.-COLONEL SABINE ON TERRESTRIAL MAGNETISM. 
27 
Table IX. (Continued.) 
Station. 
Date. 
Poles. 
Inclination. 
Direct. 
Reversed. 
60 
59-6 
61 
07-5 
61 
03-6 
58 
53-2 
58 
55 
58 
54-1 
58 
14-7 
58 
28-1 
58 
21-4 
56 
49*5 
57 
22-7 
57 
06-1 
54 
01-9 
54 
58 
54 
29-9 
51 
12-7 
52 
09-4 
51 
41-0 
45 
22-1 
47 
40-5 
46 
31-3] 
46 
34-0 
45 
37*5 
47 
36-0 
46 
36-7 j 
44 
37-5 
46 
41-0 
45 
39-3 
45 
42-7 
47 
30-0 
46 
36-3] 
> 46 
38-5 
45 
43-6 
47 
37-7 
46 
40-7 J 
43 
43 
34-5 
40-8 
45 
45 
22-8 
31-7 
44 
44 
28*7 1 
36-3 J 
> 44 
32*5 
43 
39-9 
45 
39-4 
44 
39-6" 
43 
38-4 
45 
39-4 
44 
38-9 
43 
42-7 
45 
29-9 
44 
36*3 
)> 44 
38-3 
43 
39-9 
45 
29-9 
44 
34-9 
43 
42-7 
45 
40-6 
44 
41-6J 
39 
31-8 
41 
55-5 
40 
43*7 
35 
21-4 
38 
44-6 
37 
03-0 
— 13 
20-2 
-14 
53-6 
-14 
06-9 1 
— 13 
12-3 
-14 
50-6 
-14 
01-5 
Ul4 
06-0 
— 13 
22-5 
— 14 
56*5 
-14 
09*5^ 
-30 
13-9 
— 30 
19-7 
-30 
16-8 
-30 
1 Q*0 
-30 
18-0 
-30 
24-4 
-30 
21-2 J 
— 30 
07-1 
-31 
08-6 
-30 
37-9 
-30 
00 
-30 
38-2 
— 30 
19-1 
-29 
43-4 
— 30 
08-2 
-29 
55-8 
—30 
04-8 
-30 
13-4 
-30 
09-n 
-29 
44*6 
-30 
37-5 
-30 
11-1 
J> — 30 
15-3 
-29 
27*7 
-31 
11-1 
-30 
19*4 
-29 
28-7 
-31 
14-8 
-30 
21-7 J 
Remarks. 
Monterey 
S ta Barbara 
San Pedro 
San Diego 
San Quentin .... 
San Bartholomew 
Magdalena Bay | 
San Lucas Bay . . 
Mazatlan . . . . j 
r 
San Bias. 
Socorro Island . . 
Clarion Island . . 
Martins Island 
{ 
Bow Island. . . . < 
1839. 
October 5 . . 
October 10 . 
October 12 . . 
October 17 . . 
October 24 . . 
October 29 . . 
November 1 
November 1 
November 21 
November 29 
December 2 
December 6 
December 19 
December 8 
December 8 
December 10 
December 10 
December 11 
December 26 
December 29 
1840. 
January 23 . . 
January 25 . , 
January 27 . . 
February 6. . 
February 29. . 
February 25. . 
February 26. . 
February 27. . 
February 22. . 
March 14. . . . 
March 20. . . . 
March 21. . . . 
Fossil Island. 
Beach. 
Tepic. 
Anna Maria Bay. 
Entrance Village. 
S.E. point. 
S.W. point. 
Western extreme. 
Observatory. 
Total Intensity. — The values of the total intensity of Captain Belcher’s American 
stations are deducible from the values of the horizontal intensity in Table VI., and 
of the inclination in Table IX., by the formula 
T , T h! sec i' 
where i, h, and I are the inclination, horizontal and total intensities at Woolwich, 
and i', h', and I' the values of the same at any other station. Regarding Woolwich 
and London as identical, we have I = L372, the conventional number by which the 
total intensity in London is usually expressed. The values of the total intensity in 
Table X. have been thus computed. 
Declination . — The declinations were observed with a nine-inch altitude and azimuth 
instrument by Cary, having a four-inch magnetic needle attached, which was read 
at both extremities. Each determination is stated to be the mean result of several 
observations, both of the true meridian, and of the magnetic direction. 
e 2 
