74 



ELEMENTARY LESSONS ON [CHAP. n. 



SO. Magnetic Attractions and Repulsions. 



If we take a magnet 

 (either natural or 

 artificial) in our hand 

 and present the two 

 " poles " of it succes- 

 sively to the north- 

 pointing end of a 

 magnetic needle, we 

 shall observe that 

 one pole of the mag- 

 net attracts it, while 

 the other repels it. 

 (Fig. 43-) If we 

 repeat the experi- 

 ment on the south- 

 pointing end of the 

 magnetic needle, we 

 shall find that it is 

 repelled by one pole 

 and attracted by 

 the other ; and that the same pole which attracts the 

 north-pointing end 

 of the needle re- 

 pels the south- 

 pointing end. 



If we try a simi- 

 lar experiment on 

 the magnetic 



needle, using for 

 a magnet a second 

 magnetised needle 

 which has previ- 

 ously been sus- 



Fig. 42. 



Fig. 43- 



pended, and which has its north-pointing end marked 

 to distinguish it fiom the south-pointing end, we shall 

 discover that the N. -pointing pole repels the N. -pointing 



