184 



MAGNETS. 



steel; the second is shaped like a letter U, the ends being 

 thus brought near together, as shown in Fig. 119. 



3O4. Distribution of Magnetic Force. If a 



bar magnet be rolled in iron filings and then withdrawn, 

 the filings cling to the ends of the bar but not to the 

 middle. This peculiar form of attraction is not evenly 



FIG. 120. 



distributed throughout the bar. It is greatest at or 

 near the ends. These points of greatest attraction are 

 called the poles of the magnet. 



3O5. Attraction between a Magnet and Or- 

 dinary Iron. Bring either end of a bar magnet near 

 the end of a piece of iron ; the iron is attracted. Bring 

 the same end of the magnet near the middle of the iron ; 

 the iron is attracted. Bring the same end of the magnet 



