90 
ON THE EAETH’S MAGNETIC EOECE AT BOMBAY. 
V. Absolute Macjnetical Besults. 
Collected together. 
Table XX. 
Magnetic Element. 
Epoch. 
Value at 
epoch. 
Value at com- 
mon epoch, 
1st January, 
1871. 
Secular 
change 
per annum. 
Semiannual 
inequality : 
excess of April to 
September 
over mean of year. 
Declination 
Dip A .. 
Horizontal force ... 
Do. 
Total force 
Do 
1st October, 1870 . . . 
1st October, 1868 . . . 
1st October, 1870 ... 
0 49 32 
19 4-2 
8-0658 
0 50 8 
19 8-5 
8-0669 
3-7195 
8-5391 
3-9372 
4-1 48 
4-1-9 
4- -0045 
4- -0021 
4- -0063 
4- -0029 
-6 i 
+0-3 
4- -0009 
4- -0004 
4- -0012 
4- -0006 
Eoot-grain-second units. 
Metre-grainme-second units. 
Foot-grain-second units. 
Metre-gramme-second units. 
