DIAMAGNETISM. 



I2 3 



CHAPTER XIV. 



DIAMAGNETISM. 



"\17HILE only a few kinds of elementary sub- 

 stances such as iron, nickel, and various 

 crystals manifest polarized magnetic force, all 

 kinds of substances, in- 

 cluding organized com- 

 pounds, such as wood, 

 coal, &c., manifest dia- 

 magnetism when they are 

 held between the poles 

 of a powerful electro- 

 magnet ; as exhibited in 

 Fig. 42. 



The attraction acting 

 on the sides of bodies is 

 commonly exhibited, by suspending them by a 

 flexible thread between the poles of electro-magnets. 

 If a silver or copper coin be thus suspended, it is 

 turned about with the flat sides diamagnetically 

 fronting the two opposite poles ; while a bar of 

 iron, nickel, bismuth, and various crystals are 

 arranged in a longitudinal position between the 

 two poles. 



