194 
Transactions of the Boyal Society of South Africa. 
Naauwpoort. (2, 3) 
Date. Declination. Dip. Horizontal Intensity. 
1908-48 25° 14'-7 W. 60° 36'-8 S. -17810 
1901-97 26 17-6 56 50-2 -18340 
1898-27 59 24-3 -18599 
Secular Variation. 
1908-48-1901-97 = 6-51 yrs. -9'-7 +7'-2 -81y 
1901-97-1898-27 = 3-7 yrs. +7-0 -70y 
Nelspruit. (2, 4) 
Date. Declination. Dip. Horizontal Intensity. 
1911-59 19° 41'-4 W. 59° 08'-4 S. -18612 
1903-69 20 57-1 58 29-8 -19278 
Secular Variation. 
1911-51-1903-69 = 7-82 yrs. -9'-7 +4'-9 -85y 
Newcastle. (2, 3, 4) 
Date. Declination. Dip. Horizontal Intensity. 
1913-50 20° 33'-6 W. 60° 24'-7 S. -17975 
1908-50 21 46-5 59 57-1 -18471 
1903-75 22 31-2 59 41-0 -18827 
Secular Variation. 
1913-50-1908-50 = 5 yrs. -14'-6 +5'-5 -99y 
1908-50-1903-75 = 4-75 yrs. -9-4 +3-4 -75y 
1913-50-1903-75 = 9-75 yrs. -12-1 +4-5 -87y 
Orange River. (2, 3) 
Date. Declination. Dip. Horizontal Intensity. 
1908-49 24° 36'-2 W. 59° 40'-0 S. -18138 
1902-55 25 33-3 59 01-0 -18635 
1898-00 58 23-0 -18950 
Secular Variation. 
1908-49-1902-55 = 5-94 yrs. -9'-6 +6'-6 -84y 
1902-55-1898 = 4-55 yrs. +8-3 -69y 
