176 THE MAGNETIC CIRCUIT [ART. 55 



times provided with interpoles, in order to improve the commu- 

 tation and to use a higher specific electric loading. 1 



1 For further details in regard to the armature reaction in a rotary con- 

 verter see Arnold, Wechselstromtechnik, Vol. 4 (1904), Chap. 28; Pichel- 

 mayer, Dynanwbau (1908), p. 276; Standard Handbook, index under " Con- 

 verter, synchronous, effective armature resistance"; Parshall & Hobart, 

 Klcctric Machine Design (1906) p. 377; Lamme and Newbury, Interpoles in 

 Synchronous Converters, Trans. Amer. Inst. Electr. Engrs., Vol. 29 (1910), 

 p. 1625. 



