GRAPHICAL DYNAMICS. Ivii 



motion is in a plane, the outer forces being also in this plane. In the sec- 

 ond part he subjects to graphical treatment the action of outer forces upon 

 a free movable material point. The third part, finally, considers the motion 

 of rigid invariable systems acted upon by given forces. 



In the course of the development extended use is made of analytical 

 formulae. The work is but the beginning of the future structure, but this 

 beginning will be thankfully received by all those with whom graphical 

 methods have found acceptance. 



