CHANGE IN DIRECTION OF EARTH S MAGNETIC FIELD, 
309 
Lat. 18° 56' N. BOMBAY. Long. 72° 54' E. 
Year. 
Magnetic 
dip or in¬ 
clination. 
Authority. 
Observer. 
Where recorded. 
1845. 
o 
+17.98 
Orlebar. 
Phil. Trans. Royal Society, 1875. 
1847. 
+18.30 
+18.87 
Do. 
1849. 
Cassini. 
Annales Hydrographiques, 1851. 
1856. 
+19.10 
Schlagintweit. 
Phil. Trans. Royal Society, 1875. 
1863.... 
+19.22 
Johnson’s Encyclopedia. 
1867.5 .... 
+19.03 
Observatory. 
Phil. Trans. Royal Society, 1875. 
1868.5 .... 
+19.07 
.do. 
Phil. Trans. Royal Society, 1876. 
1869.5 .... 
+19.10 
Do. 
1870.5 .... 
+19.13 
Do. 
1871.5 .... 
+19.15 
... do.. 
Bombay Magnetic and Meteorological Observa¬ 
tions. 
1872.5 .... 
+19.23 
Do. 
1873.5 .... 
+19.25 
Do. 
1874.5 .... 
+19.25 
Do. 
1875.5 .... 
+19.22 
Do. 
1876.5 .... 
+19.20 
Do. 
1877.5 .... 
+19.33 
.do. 
Do. 
1878.5 .... 
+19.33 
Do. 
1879.5 .... 
+19.37 
.do. 
Do. 
1880.5 .... 
+19.37 
.do. 
Do. 
1881.5 .... 
+19.53 
Do. 
1882.5 .... 
+19.72 
.do.. 
Do. 
1883.5 .... 
+19.72 
.do. 
Do. 
1884.5 .... 
+19.75 
Do. 
1885.5 .... 
+19.77 
.. do. 
Do. 
1886.5 .... 
+19.77 
Do. 
1887.5 .... 
+19.77 
.do. 
Do. 
1888.5 .... 
+20.18 
.do. 
Do. 
1889.5 .... 
+20.27 
Do. 
1890.5 .... 
+20.33 
..... ... do. 
Do. 
1891.5 .... 
+20.42 
Do. 
1892.5 .... 
+20.50 
.do... 
Do. 
1893.5 .... 
+20.58 
Do. 
1894.5 .... 
+20.68 
Do. 
45-Bull. Phil. Soc., Wash., Vol. 13. 
