PLANE CURTB. 



1 J J 



The curve y - J<? (f + <!"). 



'' denote the length of an arc of the curve measured from 

 o-ordin 



whote co 



tes are 0, c, to the poi: h we 



for the co-ordinate* of iU centre of gravity 





thlH 



All . 



' 



-"'), nd'-j (-"). 



therefore 





- y (_.) _(. + d ) + c 



