300 
LITTLEHALES. 
Lat. 1° 18' N. SINGAPORE. Long. 103° 51' E. 
Year. 
Magnetic 
declina¬ 
tion. 
Authority. 
Observer. 
Where recorded. 
1824 
o 
—1.83 
'Rnncninville ... 
Becquerel’s Traite du Magnetisme. 
1830. 
—2.00 
La, Place... 
Do. 
1843 ... 
—1.72 
Beecher.».... 
Phil. Trans. Royal Society, Part 1,1875. 
184(1 
—1.60 
Elliott....... 
Do. 
1876.5 .... 
—2.53 
Dr. van Riickevorsel.. 
Trans. Royal Academy of Sciences, Amsterdam, 
1880. 
1890.5.... 
—2.57 
Lieut. Courmes, Fr, N.. 
U. S. Hydrographic Office, Notice to Mariners, 
No. 38,1890. 
Year. 
Observed. 
Computed. 
O-C. 
o-c 2 . 
o 
o 
1824. 
—1.83 
—1.52 
—0.31 
0.0961 
1880. 
—2.00 
—1.78 
—0.22 
0.0484 
1843.. 
—1.72 
—2.03 
+0.31 
0.0961 
Probable error of a single observation = ± 17'. 
1846. 
—1.60 
—2.10 
+0.50 
0.2500 
Period = 400 years. 
1876.5 .... 
—2.53 
—2.47 
—0.06 
0.0036 
1890.5 .... 
—2.57 
—2.42 
—0.15 
0.0225 
0.5167 
Empirical equation for determining the declination for any year: v — 0°.24 — 
1.18 sin (t — 1850) — 2.4307 cos ~ (t — 1850). 
