Secular Variation of the Magnetic Elements. 
193 
Secular Variation. 
Date. 
Declination. 
1913-48- 
-1912-48 = 
lyr. 
-12'-4 
1913-48- 
-1908-47 = 
5-01 yrs. 
-11-1 
1912-48- 
-1908-47 = 
4-01 yrs. 
— 10-5 
lyUO 4: I- 
1 Qf\(\'^C\ 
-lyuo ou = 
± y / y^s. 
1908-47- 
-1905-09 = 
3-38 yrs. 
-7-8 
190509- 
-1900-47 = 
4*62 yrs. 
-8-6 
1904-52- 
-1900-28 = 
4-24 yrs. 
-7-2 1 
1903-00- 
-1900-28 = 
2-72 yrs. 
-7-3 
1903-00- 
-1899-55 = 
3 45 yrs. 
1913-48- 
-1900-28 = 
13*20 yrs. 
-8-9 
1913-48- 
-1899-55 = 
13-93 yrs. 
Dip, Horizontal Intensity. 
-f7'-8 -767 
+ 7-6 -97y 
+ 7-6 -102y 
-f7-6 -93y 
-f6-3 -95y 
-f8-8 -77y 
\,^. (1904-52-1 ^„ 
}+^^ 11899-55 |-^^^ 
-f8-7 
+ 8-5 
-f7-7 -88y 
Mauritius. 
Date. 
Declination. 
Dip. 
Horizontal Intensity. 
1909 
9° 
16'-3 W. 
53° 39'-8 
S. -23377] 
1908 
9 
14-3 
53 44-9 
-23415 [t.M., vol. xvi.,p. 214 
1907 
9 
13-6 
53 49-0 
-23461 ) 
1903 
9 
15-9 
53 59-4 
•23680 1 
1900 
9 
29-0 
54 11-0 
.23325 [ T.M. , vol. xii.,p. 181 
1898 
9 
39-2 
54 22-4 
•23873 T.M., vol. viii., p. 8 
1897 
9 
43-6 
54 27-4 
•23900 T.M., vol. v., p. 128 
1896 
9 
48-7 
54 32-3 
•23913 T.M., vol. iv., p. 135 
1890 
10 
08-9 
54 51-2 
-24079) Mauritius Mag. Ee- 
1880 
10 
43-3 
55 02-0 
J ductions by Claxton. 
Secular 
Variation. 
Date. 
Declination. 
Dip. 
Horizontal Intensity 
1909-1907 = 
2 yrs. 
+ l'-4 
-4'-6 
-42y 
1907-1900 = 
7 yrs. 
-2-2 
-3-1 
-52y 
1907-1890 = 
17 yrs. 
-8-0 
-4-0 
-25y 
1890-1880 = 
: 10 yrs. 
-3-4 
-1-2 
Mozambique. 
(5) 
Date. 
Declination. 
Dip. 
Horizontal Intensity. 
1898-95 
11° 24'-5 W. 
49° 39'-2 S. -24349 
1906-65 
9 50-4 
49 54-1 
-24053 
Secular Variation, 
1906-65-1898-95 = 7-70 yrs. - 12'-3 + 1'-8 
-38y 
