Secular Variation of the Magnetic Elements. 187 
Ceres Road. (2, 3) 
Date. 
1908-76 
1900-40 
1898-18 
Declination. 
27° 38'-0 W. 
28 45-1 
59° 
58 
58 
Dip. Horizontal Intensity. 
' 55'-7 S. -17873 
41-9 
24-4 
•18552 
•18722 
Secular Variation. 
1908-76-1900-40 = 8-36 yrs. -8'-0 +8'-8 
1900-40-1898-18 = 2-22 yrs. + 8-8 
-81y 
-77y 
Date. 
1910-97 
1902-54 
Coerney. (2, 4) 
Declination. Dip. Horizontal Intensity, 
25° 52'-2 W. 62° 16'-4 S. -16942 
27 27-4 61 22-4 -17716 
Secular Variation. 
1910-97-1902-54 = 8-43 yrs. - ll'-6 +6'-4 
-92y 
Gradock. (2, 3, 7) 
Date. Declination. Dip. 
1913-52 24° 29'-8 W. 61° 46'-3 
1908-48 25 39-6 61 19-2 
1900-05 26 59-8 60 23-7 
1898-28 60 05-8 
Secular Variation. 
1913-52-1908-48 = 5-04 yrs. - 13'-8 +5'-4 
1908-48-1900-05 = 8-43 yrs. -9-5 +6-6 
1900-05-1898-28 = 1-77 yrs . + 7-3 
1913-52-1900-05 = 13-47 yrs. - 11-2 
1913-52-1898-28 = 15-24 yrs. +6-6 
Horizontal Intensity, 
-17107 
•17620 
•18295 
-18450 
-102y 
-80y 
-81y 
Dar-es-Salam. (3, 5, 9) 
Date. 
1909-74 
1906 67 
1905-74 
1898-70 
Declination. 
6° 35'-0 W. 
7 06-3 
7 12-8 
8 04^0 
Dip. Horizontal Intensity. 
37° 19'-8 S. ^28396 
37 00-1 -28651 
36 57-0 
•28974 
