188 
Transactions of the Boyal Society of South Africa, 
Date. 
1909-74-1906-67 = 3-07 yrs. 
1909-74-1905-74 - 4-00 yrs. 
1905-74-1898-70 = 7-04 yrs. 
1909-74-1898-70 = 11-04 yrs 
Secular Variation. 
Declination. ' 
-10'-2 
-9-4 
-7-2 
Dip. 
+ 6'-4 
+ 2-1 
Horizontal Intensity. 
-83y 
-537 
Date. 
1911-50 
1902-02 
East London. (2, 4) 
Declination. Dip. Horizontal Intensity. 
24° 57'-l W. 62° 29'-0 S. -16867 
26 45-5 61 36-3 -17736 
Secular Variation. 
1911-50-1902-02 = 9-48 yrs. - ll'-4 +5'-6 
-92y 
Date. 
1913-10 
1907-02 
1913-10-1907-02 = 6-( 
Eendekuil. (4, 6) 
Declination. Dip. Horizontal Intensity. 
26°48'-8W. 60°00'-l -17521 
27 41-2 59 12-9 -18096 
Secular Variation. 
]yvs. -8'-6 +7'-9 
-94y 
Date. 
1913-51 
1903-77 
Estcourt. (2, 7) 
Declination. 
21° 01'-3 W. 
23 15-7 
Dip. Horizontal Intensity, 
61° 07'-5 S. -17478 
60 13-9 -18358 
Secular Variation. 
1913-51-1903-77 = 9-74 yrs. - 13'-8 +5'-5 
-90y 
Date. 
1912-50 
1902-10 
1897-99 
Fraserburg" Road. 
Declination. 
26° 00' -5 W. 
(2, 4) 
Dip. Horizontal Intensity. 
61° 05'-4 S. -17384 
59 48-0 -18370 
59 14-3 
Secular Variation. 
1912-50-1902-10 =--10-4 yrs. 
1902-10-1897-99 = 4-11 yrs. 
+ 7'-7 
+ 8-2 
-95y 
