208 



The Great Indian Arc of Meridian, 



[No. 3. 



Remarks. 



ABC is the actual arc of 

 the meridian. 



A is Kuliana in lat. 29° 

 30' 48". 



B is Kulianpur in lat. 24° 

 7' 11". 



C is Damargida in lat. 18° 

 3' 15". 



H is the mass of the Him- 

 alayas. 



Aa, Bb, Co are normals to 

 the arc ABC, or the lines in 

 which the plumb-line would 

 hang if the Himalayas did 

 not attract. 



Aa', Bb', Cc' are the actual 

 plumb-lines, inclined to the 

 above, owing to attraction. 



In my paper in the Philo- 

 sophical Transactions of 1855, 

 the following are the results 

 of attraction 



/L aAa'=27".S53,LbBV= 

 ir.968 ZcCc'=Q".909. 



Cnm is the curve drawn 

 from Damargida which cuts 

 all the actual plumb-lines at 

 the stations on the arc at 

 right angles. 



