318 
LITTLEHALES. 
Lat. 23° 09' N. 
HABANA. 
Long. 82° 22 / W. 
Year. 
Magnetic 
dip or in¬ 
clination. 
o 
1801. 
+53.37 
1822. 
+51.92 
1857... 
+52.00 
1879........ 
+52.30 
1885.9 .... 
+52.33 
1887.3 .... 
+52.17 
Authority. 
Observer. 
Where recorded. 
A. von Humboldt. 
Sabine.. 
Friesach. 
Lieut. Commander Ackley, 
U. S. N. 
Lieut. Aubry, Fr. N. 
Becquerel’s Traite du Magn6tisme, 1846. 
Phil. Trans. Royal Society, Part I, 1875. 
Do. 
Report of Coast and Geodetic Survey, 1881. 
Observaciones Magneticas y Meteorologicas del 
Real Colegio de Belen, 1876. 
Annales Hydrographiques, vol. II, 1888. 
_2 
Year. 
Observed. 
Computed. 
O-C. 
O-C . 
o 
o 
1801. 
+53.37 
+53.36 
+0.01 
0.0001 
1 
1822. 
+51.92 
+52.35 
—0.43 
0.1849 
1857. 
+52.00 
+51.74 
+0.26 
0.0676 
1879.. 
+52.30 
+52.03 
+0.27 
0.0729 
•Probable error of a single observation — ± 14'. 
1885.9 .... 
+52.33 
+52.26 
+0.07 
0.0049 
1887.3 .... 
+52.17 
+52.30 
—0.13 
0.0169 
0.3473 
Empirical equation for determining the inclination for any year: I == 51°.76 
0.0058 {t — 1850) + 0.00055 {t — 1850) 2 . 
