THE ROTARY CONVERTER. 



321 



and the normal ratio of transformation, without armature 

 drop, &c., was therefore '675 instead of T~- or '707. 



EXPERIMENT XLVI. DETERMINATION or CHARACTERISTIC 

 AND EFFICIENCY OF A EOTARY CONVERTER. (1) WHEN 

 EUN FROM THE DIRECT-CURRENT SlDE. 



DIAGRAM OF CONNECTIONS. 



FIG. 160. 



Source of direct current. 

 R C Armature of rotary converter. 

 F Field windings. 

 A l Ammeter reading direct current supplied to 



armature. 

 At Ammeter reading alternating current given out 



by armature. 



A 3 Ammeter reading exciting current. 

 F! Voltmeter reading direct voltage applied. 

 F 2 Voltmeter reading alternating voltage given out. 

 S S Starting switch. 



RI Variable non-inductive resistance in load circuit. 

 R* Shunt regulating resistance. 

 S Switch for breaking load circuit." 

 . Instructions. Connect the brushes of the direct-current 

 side of the converter to a source of direct current. Con- 

 nect also the field windings to the same supply in series 

 with an ammeter and regulating resistance. Connect the 

 terminals of the alternating side to a variable non-induc- 

 tive resistance in series with an ammeter and switch. 

 Connect voltmeters to the terminals of both the direct 

 and alternating sides. 



Start the machine in the same manner as an ordinary 

 direct-current motor, with the switch in the alternating 



