330 



THE ROTARY CONVERTER. 



The field windings must be supplied with direct 

 currents which may conveniently be obtained from the 

 D.C. side of the converter itself. 



EXPERIMENT XLYIII. DETERMINATION or CHARACTERISTIC 

 AND EFFICIENCY OF A ROTARY CONVERTER. (2) WHEN RUN 

 FROM THE ALTERNATING-CURRENT SIDE. 



DIAGRAM OF CONNECTIONS. 



M l M* Source of alternating current. 



MI ra 2 Source of direct current. 



R. G. Armature of rotary converter. 



F Field windings. 



A l Ammeter in alternating supply circuit. 



A 2 Ammeter in direct-current load circuit. 



A 3 Ammeter in field circuit. 



V l Voltmeter reading alternating supply voltage. 



F 2 Voltmeter reading direct-current voltage. 



W Wattmeter reading power supplied. 



S l $ 2 Switches. 



L Synchroniser. 



RI Variable resistance in load circuit. 



R 2 Field-regulating resistance. 



Instructions. Connect the alternating side of the machine 

 to the source of alternating current in series with an 

 ammeter, series winding of a wattmeter and switch. 

 A synchroniser of some kind must also be provided. 

 Connect a voltmeter and the volt coil of the wattmeter 

 to the alternating terminals^ of the converter. Connect 

 the field winding to a supply of direct current through an 

 ammeter and regulating resistance. Connect the direct- 



