748 
AECHDEACOZs PEATT OX THE HEFLECTIOX 
^ 3. Summary of data and of some of the results of the forme) Pajjer, 
necessary for the jyresent calculation. 
5. Before proceeding it is necessary here to gather into one riew such of the results 
of my former Paper * as will be required for the present calculation. 
The Great Arc under consideration is in longitude 77° 42'. The three principal 
stations of this arc, the latitudes of which hare been obserwed astronomrcally, are A, or 
Kaliana, in latitude 29° 30' 48"; B, or Kalianpur, 24° 7' 11"; and C, or Damargrda. 
18° 3' 15". The lerrgths of the two arcs, Kaliana— Kalianpur, and Kahanpur— Damar- 
gida, as determirred by the Survey, are 326859-52 and 367154-37 fathoms. 
6. In order to effect the calculation of the attraction on the three stations, the mass 
is conceived to be divided into smaller masses in the foBonung manner, talang the 
station A for example. From the point A (fig. 1) great circles are drawn meeting in 
Tig- 1. 
* Philosophical Transactions, 1855, pp. 53-100. 
