330 SYNCHRONOUS MACHINES. [Exp. 



26. With a given series winding, flat-compounding can be 

 obtained by trial by adjusting the series reactance or adjusting 

 a shunt around the series turns (23, Exp. i-B). 



27. Derived Neutral. Obtain a derived neutral (12) and 

 test as a converter or as a generator with unbalanced load. 



