1878.] E. S. Brough — Magnetic Elements for Northern India. 



69 



The subject -is, however, one on which it is hoped that Members of 

 the Society will be able to form an opinion from the information now 

 placed before them. 



The figure has been taken into Benares, and made over to Captain 

 Boileau, R. E., who has been good enough to take charge of it, until the 

 wishes of General Cunningham as to its disposal are known. 



It appears desirable to take advantage of the present opportunity to 

 bring to the notice of the Society, that, unless steps are promptly taken to 

 preserve the outer stone carving of the Dhameh stupa, this unique speci- 

 men of ancient Indian art will soon be seriously damaged. When we were 

 at Sarnath, some of the large stones of the well known beautiful tracery 

 appeared to be on the point of falling out. 



The expenditure necessary for saving this portion of the building from 

 ruin would be inconsiderable now. If the stones are once allowed to fall to 

 the ground, the expense, and difficulty of restoration will become enormous. 



3. A few Magnetic 'Elements for Northern India. — By R. S. Beotjgh. 

 Having recently had occasion to measure the dip of the needle and 

 the strength of the horizontal component of the earth's magnetic force at 

 Calcutta, Jubbulpore and Allahabad, with a view to ascertaining to what 

 extent the indications of an arbitrarily calibrated galvanoscope, uncorrected 

 for the local value of the earth's magnetism, would be trustworthy, I think 

 it desirable to put the results on record. 



The horizontal intensity was measured with a Kew-pattern portable 

 unifilar magnetometer, and the observations have been corrected for tem- 

 perature, torsion and scale error — 



Stations. 



Longitude. 



Latitude. 



Date. 



22« 32' 32'' 

 23° 10' 00" 

 25° 27' 43" 



Jan. 1878 

 Dec. 1877 

 Dec. 1877 



Horizontal 

 force in 

 dynes. 



Dip. 



Calcutta, . . . 

 Jubbulpore, 

 Allahabad, . 



88° 22' 50" 

 80° 00' 00" 

 81° 54' 12" 



0-37158 

 0-36667 

 0-35915 



28° 59' 30" 

 29° 28' 30" 

 33° 18' 45" 



Dividing the horizontal component by the cosine of the dip, we obtain 

 the total force thus : — 



Calcutta : 0-42482 dyne 



Jubbulpore : 0-42084 „ 



Allahabad : 0-42977 „ 



There are on record several observations of the dip in Calcutta, which it 



will be interesting to bring together here. 



