Brard 



Finally, when the motion is parallel to the (z,x)-plane, we have a set of 



forces 



on Oz: 



on Ox: - I p AU^ 



Cx+ ^T^x J+ -d-t) 



Cx+ ^X'^xJ^ ^n-t) 



f pAU^ 



> (4a) 



The moment about the y-axis is 



- f pALU' 



Cn, + ^"A" Cx„^b1 + ^-^ 



(4b) 



In these formulae, symbol 1 indicates that we may have to deal with several 

 sets of planes. 



8. Final Formulae (case of par. 4: quasi-rectilinear motion 

 parallel to the (z,x)-plane) 



( Continued) 



866 



