316 
LITTLEHALES. 
Lat. 29° 57' S. COQUIMBO. Long. 71° 22' W. 
Year. 
Magnetic 
dip or in¬ 
clination. 
Authority. 
Observer. 
Where recorded. 
1710. 
o 
—47.42 
Femll6e. 
Ilansteen’s Magnetismus der Erde, 1819. 
1791 . 
—40.45 
Mfilasnirm. 
Berliner Astronomisches Jahrbuch, 1828. 
1868. 
—29.92 
IT. M. S. Nassau. 
Phil. Trans. Royal Society, 1877. 
1883. 
—29.40 
Ensign Favereau,! 
Fr. N. 
Annales Hydrographiques, 2d series, 1884. 
Year. 
Observed. 
Computed. 
O-C. 
~l -2 
O-C . 
1710. 
o 
—47.42 
o 
—47.43 
+0.01 
0.0001 
, 
1791. 
—40.45 
—40.46 
+0.01 
0.0001 
I Probable error of a single observation = ± 3'. 
1868.. 
—29.92 
—29.87 
—0.05 
0.0025 
| Period = 327 years. 
1883. 
—29.40 
—29.45 
+0.05 
0.0025 
J 
0.0052 
Empirical equation for determining the inclination for any year: I = — 38°.53 
+ 5.51 sin 1.1 (< — 1850) + 7.22 cos 1.1 {t — 1850). 
