324 
LITTLEHALES, 
Lat. 34° 54' S. MONTEVIDEO. Long. 56° 12' W. 
Year. 
Magnetic 
dip or in¬ 
clination. 
Authority. 
Observer. 
Where recorded. 
1790. 
o 
—42.22 
Berliner Astronomisch.es Jahrbuch, 1828. 
1827..../... 
—36.47 
Phil. Trans. Royal Society, Part II, 1877. 
1 833. 
— 34 85 
Do. 
1836. 
—34.83 
“ Bonite ” 
Do. 
^ 838. 
34- 05 
Do. 
1852. 
—32.12 
Mfl.cra.fi .. 
Do. 
1866. 
—31.10 
Hfl.rknfiss 
Do. 
1867. 
—31.03 
H. M. S. Nassau... 
Do. 
1876.2.... 
—29.81 
H. M. S. Challenger..... . 
Voyage of H. M. S. Challenger. 
1882.7 .... 
—29.33 
Lieutenants Barnaud and 
Annales Hydrographiques, 1884. 
Barnardi&res, Fr. N. 
1893.4 .... 
—28.13 
Lieutenant Mottez 
, Fr. N.... 
Annales Hydrographiques, vol. II, 1893. 
1895.9 .... 
—28.30 
Lieutenant Schwerer, Fr.N. 
Annales Hydrographiques, 1896. 
Year. 
Observed. 
Computed. 
O-C. 
o-c 2 . 
1790. 
o 
—42.22 
o 
—42.22 
+0.00 
0.0000 
1827.... 
—36.47 
—35.94 
—0.53 
0.2809 
1833. 
—34.85 
—35.06 
+0.21 
0.0441 
1836. 
—34.83 
—34.64 
—0.19 
0.0361 
1838. 
—34.05 
—34.36 
+0.31 
0.0961 
1852. 
—32.12 
—32.53 
+0.41 
0.1681 
1866. 
—31.10 
—30.92 
—0.18 
0.0324 
-Probable error of a single observation = ± 12'. 
1867. 
—31.03 
—30.82 
—0.21 
0.0441 
1876.2 .... 
—29.81 
—29.88 
+0.07 
0.0049 
1882.7 .... 
—29.33 
—29.27 
—0.06 
0.0036 
1893.4 .... 
—28.13 
—28.38 
+0.25 
0.0625 
1895.9 .... 
—28.30 
—28.14 
—0.16 
0.0256 
0.7984 
Empirical equation for determining the inclination for any year: I = — 32°.78 
+ 0.125 (t — 1850) — 0.00054 (t — 1850) 2 . 
