110 



EFFECT OF CAPACITY. 



The readings should be entered in tabular form, and a 

 curve plotted with frequency, or revolutions per minute, 

 horizontal and charging current vertical. 



Fig. 51 shows the results of an experiment carried out 

 in this way on a 20 microfarad condenser, the current 



2 fi 



o 



84! 



Amperes. 



being read on a hot-wire ammeter. The alternator was a 

 4-pole machine, and the voltage was adjusted by variation 

 of its excitation and not by a resistance as indicated in 

 the diagram of connections above. The voltage was 

 maintained at 100. The curve given by the readings is 



