CiiAi\ XXl.J THE HEAVENS. 273 



rotation until checked by the acceleration resulting 

 from this approach. 



4. And if the revolvino- forces of Section 2 be 



o 



unequal, then the body lying between the two tend- 

 ing to carry it in opposite directions is retarded. 

 But, as it is carried onwards with the course of the 

 rotation of its primary, the revolving forces are in 

 less and less direct opposition, and the motion be- 

 coming accelerated, the body recedes from both 

 centres until the normal velocity and normal distance 

 from both centres is arrived at, as one revolving force 

 acts directly across the other. 



There a conjoint action of the forces commences, 

 causing acceleration, and consequently continued re- 

 cession from both centres until the forces act com- 

 pletely in conjunction. 



As it advances from that point the direct conjunc- 

 tion of the forces ceases, and the motion becomes 

 gradually retarded, letting the body fall towards both 

 centres until the normal velocity and distance from 

 both centres is again attained, as the revolving forces 

 act at right angles to each other. 



There the opposition of the forces recommences. 

 The retardation of the motion is increased, and the 

 body consequently continues to approach both centres 

 until the revolving forces are completely in opposition. 



Then, as direct opposition gradually ceases, ac- 

 celeration and recession from both centres recom- 

 mence. 



