326 
LITTLE HALES. 
Lat. 8° 57' N. PANAMA. Long. 79° 32' W. 
Year. 
Magnetic 
dip or in¬ 
clination. 
Authority. 
Observer. 
Where recorded. 
1790. 
o 
+29.48 
Malaspina 
Bode’s Astronomisches Jahrbuch, 1828. 
1837 .. 
+31.87 
F R'feleher.. 
Phil. Trans. Royal Society, 1843. 
1849. 
+32.00 
Emorv . 
Phil. Trans. Royal Society, Part I, 1875. 
1858. 
+32.50 
R W H:nV ... 
Phil. Trans. Royal Society, 1864. 
I860. 
+31.93 
Harkness 
Smithsonian Contributions to Knowledge, No. 
239, 1873. 
1891.4 .... 
+31.32 
Lieutenant Oourmes, Fr. N.. 
Annales Hydrographiques, 1892. 
Y ear. 
Observed. 
Computed. 
O-C. 
o-c 2 . 
1790. 
o 
+29.48 
o 
+29.43 
+0.05 
0.0025 
1 
1837. 
+31.87 
+31.90 
—0.03 
0.0009 
1849. 
+32.00 
+32.08 
—0.08 
0.0064 
1858. 
+32.50 
+32.11 
+0.22 
0.0484 
-Probable error of a single observation == ± 6'. 
1866. 
+31.93 
+32.04 
—0.11 
0.0121 
1891.4 .... 
+31.32 
+31.34 
—0.02 
0.0004 
0.0707 
Empirical equation for determining the inclination for any year: I — 32°.09-f 
0.0071 (t — 1850) — 0.00061 {t — 1850) 2 . 
