SOLIDS DEFYING GRAVITY. 



It will then require an additional power equal 

 to a considerable part of the original power 

 exercised in the spinning, embodied in the 

 spin, and expressed by the flight B M, to be 

 exercised in the tilting, and expressed by the 

 additional flight M N. 



The tilting will require a power equivalent 

 to that required for interfering with a 

 number of particles in their flight from B to 

 M, so that they shall fly to N. Since the possi- 

 bility of the flight is involved in the spin, the 

 power necessary to interfere with the flight 

 is involved in changing the plane of the spin. 

 This is an effort of power which is intelligible 

 to anyone. Anyone can realise that power 

 is required to alter the direction of flight in a 

 body which has already started. If we want 

 to change the direction of a shower of bullets 

 after they have left the magazine rifle, by hold- 

 ing in front of the rifle an obliquely placed 

 shield to deflect them from their original course, 

 it is easy to understand that we shall have to 

 exercise a powerful sideway thrust upon the 

 shield in order to hold it against the bullets 

 so as to change their direction. After the 

 gyroscope has been spun, every fragment of 

 its rim is in the position of a bullet which has 

 already left the rifle and is on its way. To 

 alter the tilt of the gyroscope is therefore 

 equivalent to changing the direction of the 

 potential flight of the fragments of its rim. 



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