2 It. W. Fox on Magnetic Attraction and Repulsion, 



repulsion, as the case might be; and a small pin was fixed 

 immediately above the suspended magnet, in order to insure 

 the uniformity of its position, the weights being regulated 

 accordingly. 



I first attached to the beam a small cylindrical magnet l-£ 

 inch long and jth of an inch in diameter, the south end being 

 downwards; a similar magnet was placed in the tube with 

 its north end upwards ; when the ratio of their attractive forces 

 at different distances appeared to be as follows : 



Weight in Tenths 

 of a Grain. 

 1-0 

 3-5 

 .. Y6- 



Distance. 

 1+ inch 



•I- — 

 + — 



42-5 



Distance, 



Weight in Tenths 

 of a Grain. 

 ,V inch . . 101- 

 j£ — .. 204- 

 & f- .'. 411- 



1* — .. 821" 



The same suspended magnet attracting a cylinder of soft 

 iron, of the same dimensions, substituted for the magnet in the 

 glass tube: 



The arrangement the same as the foregoing, except that 

 the north pole of the second magnet was in contact with the 

 lower end of the soft iron in the tube : 



Distance. 

 i- inch 



* — 



I afterwards substituted for the magnets above described 

 two others, each 3 inches long and T ^th of an inch in diame- 

 ter, when the following results were obtained : 



The suspended magnet with its north end downwards : 



