uares; tin refore 

 /** = ' - SPIT oo ( + /9), 



i (t) and (9) bj transposition and division 

 Pna + lf"i*in 



Wail fW WMM^BMBM^HnH^MHp- 



P I ' 



y cos a ii cos/? 

 '^ires the direction of the 



ippoee B to be the falcnim mid take the 



d of C t we have instead of equation (4) the 

 wing: 



" 



.1 new equation of condition ; but la a 



< already given, (1), (1). 01). To alow thia, 



produced to me* *rr will 



line at the same |> 

 tions are CY>ooeee(9 a) an : 



these are made equal, bv us (I), (f), 



tappoae,1 -be theuMnt at which 



tin--*.- Ht r .i:- ; .i lin< - met 1'v Milt . . i . ; , 

 i and cos A and adding, we hare 



^ Perpend tcolarot^ 

 " perpendicular 01 



fore thifl equation is a coosequeocs of the 

 j), (3), as mi liccn anlidpalad 



It follows, then, that tkt co*Jtt*m ofifmiKMmm im a 

 of any *)*cie* it thai tke t*o fix** mm* I* im*rr*ly <u lit 



<A* /ureet must ad *> a* to to**/ to t*rm lAs /< w M 



ertj of the kw renders it a u*cfu 

 ig the efficacy of a force, Foranrtwo 



T.S. 



