232 COMPENSATING MOVEMENTS, 



CHAPTER XXVI. 



EQUILIBRIUM AND PERIODICITY OF AXIAL AND 

 ORBITAL REVOLUTIONS. 



/CONNECTED with the diamagnetic current 

 of electro-magnets are consequent polarity, 

 static and dynamic conditions, or states of rela- 

 tive equilibrium and activity. These states or 

 conditions are subject, in the axial and orbital 

 revolutions, to a law of compensating movements. 



" If an axial rotation, as well as a horizontal 

 rotation, is communicated by an impulsive force, 

 analysis shows that it may be applied in any 

 plane intersecting the horizontal in the line of 

 nodes ; but if applied in the plane of the equator 

 (where it can communicate nothing but an axial 

 rotation), or in the horizontal plane, its intensity 

 must be infinite." * 



" When the earth is at one or the other of the 

 equinoxes, the plane of the equator prolonged 

 passes precisely through the centre of the sun. 

 The two poles of the planet are then symmetri- 

 cally placed with regard to the radiant body." 2 

 This is a static polarity and dynamic diamagne- 

 tism. 



1 J. G. Barnard, on the Gyroscope, p. 559. 



2 The Heavens, p. 118. Guillemin. 



