ON THE MERIDIAN. |05 



(1) 1 (1) {-»!) 



ffives <i = ~ "~~°" ^ ....-- ■'■■ ■ ' '"^^ 



(I) (-1) (1) (-?), (1). (-;0 



(Sin.*/,— Sin.*/) 4.(Sin.»r~Siu.»/) c^c. . . . (Sih.2 / ^ Sin.- /)■ 



where ^ is the terreftrial arc in fathoms and 7/ the number of com* 



1- 



t d 



plete de^jraes* Thca whcB^^ifs found, put .^=r- — ~ we fhall 



(Sin,*/.- Siu.^O, 



have X = X 4= jtt' 



I?) ('). 1. (U, (t-^fi 



X = X — Q {Siii.2 i -. Sin. 2 /> ', 



(^) CK 1^ (I) (-n.. 



X — X — Q;(9i!..?^ — Siii.^' /)■- 



H). (1;^. 1 (1) (-.4) 



X'= X — Q (Sio.2 ^ — SiiL^* /) jtc, . 



(;,) (1) \- (1)^ f-7,)-, 



^O X = X — Q (Sio.^ I — Si...^ /) ; 



To apply the firfl: formula to the prefent meafurement, it will, be 

 neceffary to have aterreftrial'arc to correrpond with' a celeftialone oi 

 ^^i?///^/^.deg,rce?3^ar.d..the. firft degree determined by. obfcrvation. If 



we begin wi^h the degree-in latitude' 9 .34 .44,;. which' is So'ky^Ss fa-*- 



O < t< 



thorns as the mean degree deduced From- aa ai^c of 2 50 10. 54 where 

 the Gorrefponding terrcftrial arc, or the diitance between Pm????^^ fta* 



Fdihnms. 



tlon, and that at Putchapolliam is ; - -*■ ^7 ^5 ^^-75 



The half of which is the diflance of the middle point of 

 the degree from ' Ptt^r/^^^o/ZmTW =- - - 85758.-375 



To which add half the degree fouth, or - - 3^236.4 [5 ^ 



Their fum is the terreflrialarc between half the degree 

 lomh of .the .middle point and Fw/^cA^/^///a??i,. • , ... ^^S99h79^- 



E e 



