VARIOUS GENERATORS OF ELECTRIC LIGHT. 99 



inducer, and the coils connected with each other, like the 

 coils of the Gramme machine, are joined by derivation wires 

 with a collector also like that of the Gramme apparatus. 

 Like most of the preceding, this is a dynamo-electric machine,- 



FIG. 32. 



and the inducer is excited by the entire induced current. In 

 the most recently constructed form of the machine, some 

 improvements, which we must briefly mention, have been 

 made. In the first place, the polar extremities of the large 

 inducing electro-magnet have been so arranged that the in- 

 tensity of the induced current can be diminished at will 



72 



