RECTIFIERS: THE SYNCHRONOUS CONVERTER 335 



and the right-hand end is attracted upwards. This closes the 

 left-hand contact, which allows current to flow into the left-hand 

 battery terminal, assumed to be positive. During the next half- 

 cycle the left-hand end of the t ransformer .is positive and the 

 right-hand end of the magnet is repelled. This doses the 

 right-hand contacts and current still flows into the positive or 



A.C. 



Spring 



Vil.r:itiiiK 



left-hand side of the battery. Hence. the battery i B uni- 



directional cm-rent, and may be charged from alternating-current 

 supply. The contact should open when the current i> 

 Thi- adjustment is made by mean- of the resistance /.'. which 

 the pha.-e uf the current in the alternating-current m:i: 



Condensers are connected across the contact- m order to mini- 



