CHANGE IN DIRECTION OF EARTH’S MAGNETIC FIELD. 319 
Lat. 22° 16" N. HONGKONG. Long. 114° 10' E. 
Year. 
Magnetic 
dip or in¬ 
clination. 
Authority. 
Observer. 
Where recorded. 
1791. 
o 
+27.92 
+29.95 
Bode’s Astronomisches Jahrbueh, 1828. 
1827. 
Beechey . 
Phil. Trans. Royal Society, Part I, 1875. 
1837. 
+30.53 
+30.05 
Do. 
1841.1 .... 
Observatory. 
Observations and Researches at the Hongkong 
Observatory, 1885. (See Appendix A.) 
1843. 
+30.05 
+30.83 
Phil. Trans. Royal Society, Part I, 1875. 
Observations and Researches at the Hongkong 
Observatory, 1885. (See Appendix A.) 
1843.8 .... 
Observatory. 
1851. 
+29.67 
+31.13 
Collinson. 
Phil. Trans. Royal Society, Part I, 1875. 
Do. 
1858. 
Novara Expedition. 
1858.1 .... 
+31.10 
Observatory. 
Observations and Researches at the Hongkong 
Observatory, 1885. (See Appendix A.) 
1872.3 .... 
+32.30 
Shadwell. 
Phil. Trans. Royal Society, Part I, 1877. 
1873.3 .... 
+32.33 
Do. 
1874.3 .... 
+32.29 
Do. 
1875. 
+32.34 
H. M. S. Challenger. 
Voyage of H. M. S. Challenger. 
1875. 
+32.30 
+31.95 
.do. 
Do. 
Erganzungsheft No. 77 zu Petermann’s Mitthei- 
lungen, Band XVIII, 1884-’85. 
1875.7 .... 
Fritsche. 
1884.5 .... 
+32.45 
Observatory.. 
Observations and Researches at the Hongkong 
Observatory, W. Doberck, director. 
1885.5 .... 
+32.44 
Do. 
1886.5 .... 
+32.43 
.do. 
Do. 
1887.5.... 
+32.37 
Do. 
1888.5 .... 
+32.35 
Do. 
1889.5 .... 
+32.28 
.do. 
Do. 
1890.2 .... 
+32.17 
.do. 
Do. 
1891.3 .... 
+32.40 
Lieut. De Roujon, Fr. N. 
Annales Hydrographiques, 2nd series, 1st vol., 
1892. 
1891.8 .... 
+32.08 
Observatory. 
Observations and Researches at the Hongkong 
Observatory, W. Doberck, director. 
1892.5 .... 
+32.05 
. do. 
Do. 
1893.5 .... 
+31.95 
Do. 
1894.5 .... 
+31.88 
......... do. 
Do. 
