WIl.l.l.Wl (HLIiKUT. 

 Fig. 3. 



59 



Pkocess ok Magnetizing Ik(.in uv Hammering while it lies in a North-anu-South 



Position. 



Fig. 4. 



(lll.UtKT's CoMI'AS.S 11 IK OuSliKVlNG IIIE VaKIAIION 



