1856.] 



Beport on the Magnetic Survey. 



557 



5. Serajgunge, on the right shore of the Kenur River— February 

 17th. Vertical intensity. 



6. Dacca — February 21st. Vertical intensity. 



7. Koolna, on the right shore of the Bhogrup-— February 24th. 

 Declination, vertical force, longitude and latitude. 



8. Calcutta, Botanical Garden, March 23rd and 24th. Declina- 

 tion, horizontal and vertical intensity, longitude and latitude. 



9. 



B — Plains of the Ganges in Hindoostan. 

 Benares — April 3rd and 4th. Declination, horizontal and 



vertical intensity, longitude and latitude. 



10. Lucknow, Oude — April 8th and 9th. Declination, horizontal 

 and vertical intensity, longitude and latitude. 



11. Agra — April 15th. Declination. 



12. Meerut — April 18th. Declination. 



The magnetic elements were therefore determined from between 

 latitude 22° to 27° 5' N. in the valley of the Brahmaputra, and to 

 29° in the plains of the Ganges iucluding a difference in longitude 

 of 16° 5' from 95° to 78° 5' East of Greenwich. 



One of the general results was, that the magnetic force, particu- 

 larly the dip, has been found much greater than is indicated by the 

 general formulae. 



The Dip. 



A. — In the valley of the Brahmaputra and delta of the Ganges, 

 the dip was found to be — 



At Debrooghur, 



.. 38° 



29' 17 



„ Tezpore, 



.. 37 



14 58 



„ Oodulgoorie, 



.. 36 



27 52 



„ Nurigoon (Bhootan,) 



.. 37 



11 69 



„ Gowhatty, .. 



.. 35 



IS 73 



„ Serajgunge,.. 



.. 32 



3 15 



„ Dacca, 



.. 31 



80 



„ Koolna, 



.. 29 



18 49 



„ Calcutta, .. 



.. 28 



6 4 



B. — In the plains of Hindoostan it was — 







At Benares, . . 



.. 32 



40 9 



„ Lucknow, .. 



.. 35 



18 20 



