284 
LITTLEHALES. 
Lat. 36° 42' S. CONCEPCION. 
Long. 73° 07' W. 
Year. 
Magnetic 
declina¬ 
tion. 
Observer. 
o 
Authority. 
Where recorded. 
1709. 
1792. 
1794. 
1821. 
1823. 
1824. 
1825. 
1826. 
1827. 
1829. 
1835. 
1882. 
—10.33 
Feuill6e 
—14.86 | 
—14.86 ) 
—15.50 
—16.27 
—15.00 
—16.82 
—16.79 
—17.03 
—16.79 
—16.80 
—17.23 
B. Hall. 
Duperrey.. 
Kotzebue . 
Beechey. 
Fitz Roy. 
Lutke. 
King. 
FitzRoy. „ 
Lieuts. Barnardi&res and 
Barnaud, Fr. N. 
1893. 
16.75 Lieut. Mottez, Fr. N. 
Year. 
Observed. 
Computed. O-C, 
0-0 
Hansteen’s Magnetismus der Erde, Christiana, 
1819. 
Brewster’s Treatise on Magnetism, Edinburg, 
1834. 
Beequerel’s Traite du Magnetisme. 
Voyage autour du Monde, Paris, 1829. 
Phil. Trans. Royal Society, 1877. 
Annales Hydrographiques, 1884. 
Annales Hydrographiques, 2d vol., 1893. 
1709. 
1792. 
1794. 
1821. 
1823. 
1824. 
1825. 
1826. 
1827. 
1829. 
1835. 
1882. 
1893. 
—10.33 
—10.45 
—14.86 
—14.74 
—14.86 
—14.85 
—15.50 
—16.25 
—16.27 
—16.30 
—15.00 
—16.34 
—16.82 
—16.37 
—16.79 
—16.41 
—17.03 
—16.45 
—16.79 
—16.54 
—16.80 
—16.72 
—17.23 
—16.97 
—16.75 
—16.70 
+0.12 
0.0144 
—0.12 
0.0144 
—0.01 
0.0001 
+0.75 
0.5625 
+0.03 
0.0009 
+1.34 
1.7956 
—0.45 
0.2025 
—0.38 
0.1444 
—0.58 
0.3364 
—0.25 
0.0625 
—0.08 
0.0064 
—0.26 
0.0676 
—0.05 
0.0025 
3.2102 
Probable error of single observation = ± 23.22'. 
Period = 360 years. 
Empirical formula for determining the declination for any year: v — — 13°. 626 
— 0.829 sin (t — 1850) — 3.424 cos (t — 1850). 
