CENTRE OF GRAVITY. 



Terrestrial Attraction the combined Action of parallel Forces. Single equivalent Force. Exam- 

 ples. Method of finding the Centre of Gravity. Line of Direction. Globe. Oblate Spheroid. 

 Prolate Spheroid. Cube. Straight Wand. Flat Plate. Triangular Plate. Centre of Gravity 

 not always within the Body. A Ring. Experiments. Stable, instable, and neutral Equilibrium. 

 Motion and Position of the Arms and Feet. Effect of the Knee-Joint. Positions of a Dancer. 

 Porter under a Load. Motion of a Quadruped. Rope Dancing. Centre of Gravity of two Bod- 

 ies separated from each other. Mathematical and experimental Examples. The Conservation of 

 the Motion of the Centre of Gravity. Solar System. Centre of Gravity sometimes called Centre 

 of Inertia. 



