ARMATURE WINDINGS. 



421 



of wire only, and each side of a coil (for a drum winding) may be 

 thought of as a single inductor. The subsequent discussion of 

 lap and wave windings is based upon the assumption that an 

 armature coil consists of two inductors only. 



43. Possible number of commutator bars or segments. It is 



evident from the discussion of the simple ring winding given in 

 Arts. 28 and 29, Chapter II., that each inductor on a ring wind- 

 ing may be a commutator bar, or be connected to a commu- 



Fig. 51. 



tator bar. Or, as stated in Art. 28, Chapter II., every second 

 inductor, or every third inductor, or every fourth inductor, etc., 

 may be connected to commutator bars. That is to say, the num- 



