QUADRANTAL EFFECT OF AN IRON SPHERE. 145 



of the sphere which is nearest to the compass-needle is 

 of the kind opposite to that of the near pole of the 



1 



needle, and there is attraction between them : but this 

 produces no deviation, because it is in the direction of 

 the needle's length. In the east and west positions 

 of the sphere, the magnetism of the north part of the 

 sphere repels that of the north end of the needle, and 

 the magnetism of the south fart of the sphere repels 



10 



