186 
Transactions of the Boyal Society of South Africa. 
Bulawayo. (2, 3) 
Date. Declination. Dip. Horizontal Intensity. 
1909-29 17° ll'-7 W. 54° 04'-5 S. -21186 
1904-59 18 27-1 53 35-6 -21389 
1898-04 52 49-5 -21798 
Secular Variation. 
1909-29-1904-59 = 4-70yrs. -15'-8(?) +5'-8 -43y 
1904-54-1898-04 = 6-50 yrs. +7-1 -63y 
1909-29-1898-04 = 11-25 yrs. +6-1 - 50y 
Cape Town. (1, 2, 3, 7) 
Date. 
Declination. 
Dip. 
Horizontal Intensity. 
1913-97 
27° 
09'-2 W. 
60° 
25'-6 S. 
-17327 
1911-23 
27 
36-8 
1911-26 
60 
05-9 
-17591 
1908-82 
28 
01-0 
1908-84 
59 
48-1 
1908-86 -17773 
1905-32 
59 
18-7 
-18121 
1904-32 
59 
14-9 
1904-30 -18186 
1903-28 
-18293 
1902-52 
28 
47-9 
1902-56 
58 
56-8 
1902-37 
•18402 
1901-00 
28 
53-9 
1900-98 
58 
41-0 
-18510 
1900-19 
58 
34-8 
1898-30 
29 
12-6 
1898-27 
58 
20-4 
1898-24 -18684 
1897-82 
29 
03-0 
58 
110 
-18795 
1895-00 
29 
18-0 
57 
52-0 
-19000 
1890-00 
29 
36-0 
57 
15-0 
-19160 
Secular Variation. 
Date. 
Declination. 
Dip. 
Horizontal In 
1913-97-1911-23 = 
2-94 yrs. 
-9'-4 
+ 6''7 
-94y 
1911-23-1908-82 = 
2-41 yrs. 
-10-0 
+ 7-4 
-77y 
1908-86-1905-32 = 
3-54 yrs. 
-98y 
1908-84-1905-32 = 
3-52 yrs. 
+ 8-3 
1908-82-1902-52 = 
6-30 yrs. 
-7-5 
1905-32-1902-56 = 
2-76 yrs. 
+ 7-9 
1905-32-1903-28 = 
2-04 yrs. 
-84y 
1902-52-1898-06 = 
4-46 yrs. 
-4-5 
+ 9-1 
1898-06-1890-00 = 
8-06 yrs. 
-3-5 
+ 7-6 
-53y 
1913-97-1901-00 = 
12-97 yrs. 
-8-1 
+ 8-0 
-91y 
