[ 229 ] 



Subftituting thefe values, A = a\ — ^ - 



" Vi_n1-I.n-S "+■ I n-\-\.n—i , n+I.n— 1.«— 2 , , , n-\-l.- n—A. , , \ 



\ "+«) 3-4 ^ 3 3'4 3-4i- ^S-i 



vn+2 ' *-34 2-3 3-4 



Next fubftituting forj'^jzjj'j, &c. their values found in the fore- 

 going problem, and taking the fluent we have 



1 fl+2 2.3 4 8.8 / 



■ - s_J±^{ 



3-44 r 

 •n-in-2 y 



T78 ) 



2.4 



II"n— I 



«+ I . « 1 



i Vf'j, ■; iJ, &c- where ^ is an arc, the cofine of • 



n — I • n— 2 f ^ 



which is — — - ~"^ and rad. i. This is the general equation 

 e e X 



for any diftance and angle. When the body arrives at the lower 

 Vol. VIII. Ef apfid, 



