

; throu; // ,l r ,n- . \ 



cling a- ,o parall 



.. tl.r 



drawn uirouf; 



mJUTml 



L are equilateral parallelograms, and there- 

 haa been already 

 regarded a* the resultant < : 



> an-l .'' see we may 



i Mil the tbvm JW, MO. and the two force* 



o they are equal and oppoaite, dertroj each 

 < hare - .hich 



together give a force rBprefcntgd in magnitude and 



Secondly, suppose the angle J 



ujjh Cr ami // 



i ///' 

 andr 







MI-\ ^ 



MK as : in inai;- 



'M.arali 



\vc have 



r .-ilr.-.ulv ihewn, 



illclogram of Foreet is completely prorcd. 

 A proof of the Parallelogram of Force* has been 



iMlfiitf CVfo; C'hnp. 1 



proof the com >rces are at first supposed to be at right 



in-nitii'lr : 



rtion. part of the prooi 



iat it may be oonrenlei" Jnoed here; it u 



illy as follows. Ix:t x and y denote two force* which 

 inclined ai resultant; 



is obvious that 

 nts instead of being x and y were iLr and *jr rtfpa*. 



