308 
LITTLEHALES. 
Lat. 6° 08 / S. BATAVIA. Long. 106° 48' E. 
Year. 
Magnetic 
Authority. 
clination. 
Observer. 
Where recorded. 
1768. 
O 
—40.00 
Wileke’s Inclination Chart. 
1828. 
—25.93 
Phil. Trans. Royal Society, Part II, 1877. 
1846. 
—27.08 
Elliot. 
Do. 
1858. 
—27.58 
Do. 
1876. 
—27.63 
Van Rijckevorsel.. 
.1 
.j 
Magnetic Survey of the Eastern part of Brazil, 
published by the Royal Academy of Sciences, 
Amsterdam. 
1882.7 .... 
—28.07 
Observatory.. 
. 
Magnetic and Meteorological Observations at the 
Batavian Observatory. 
1883.5 .... 
—27.96 
Do. 
1884.5 .... 
—28.05 
Do. 
1885.5 .... 
—28.17 
.do..... 
. 
Do. 
1886.5 .... 
—28.24 
.do. 
. 
Do. 
1887.5 .... 
—28.35 
.do. 
. 
Do. 
1888.5 .... 
—28.42 
.do. 
. 
Do. 
1889.5 .... 
—28.51 
.do. 
Do. 
1890.5 .... 
—28.72 
.do. 
Do. 
1891.5 .... 
—28.85 
.do. 
Do. 
1892.5 .... 
—28.97 
.do. 
Do. 
1893.5 .... 
—29.10 
Do. 
1894.5 .... 
—29.23 
.do. 
Do. 
Year. 
Observed. 
Computed. 
O-C. 
o=c. 
o 
o 
1768. 
—40.00 
—38.97 
—1.03 
1.0609 
1828. 
—25.93 
—28.20 
+2.27 
5.1529 
1846. 
—27.08 
—26.73 
—0.35 
0.1225 
1858. 
—27.58 
—26.48 
—1.10 
1.2100 
1876. 
—27.63 
—27.25 
—0.38 
0.1444 
1882.7 .... 
—28.07 
—27.86 
—0.21 
0.0441 
1883.5 .... 
—27.96 
—27.95 
—0.01 
0.0001 
1884.5 .... 
—28.05 
—28.06 
+0.01 
0.0001 
1885.5 .... 
—28.17 
—28.17 
—0.00 
0.0000 
Probable error of a single observation = ± 29'. 
1886.5 .... 
—28.24 
—28.26 
+0.02 
0.0004 
Period = 300 years. 
1887.5 
—28.35 
—28.41 
+0.06 
0.0036 
1888.5 .... 
—28.42 
—28.52 
+0.10 
0.0100 
1889.5 .... 
—28.51 
—28.65 
+0.14 
0.0196 
1890.5 .... 
—28.72 
—28.79 
+0.07 
0.0049 
1891.5 .... 
—28.85 
—28.92 
+0.07 
0.0049 
1892.5 .... 
—28.97 
—29.06 
+0.09 
0.0081 
1893.5 .... 
—29.10 
—29.19 
+0.09 
0.0081 
1894.5 .... 
—29.23 
—29.33 
+0.10 
0.0100 
7.8046 
Empirical equation for determining the inclination for any year: I = — 36°. 19 
+ 1.40 sin 1.2 (t —1850) + 9.61 cos 1.2 (< — 1850). 
