Experimental Influence-Machine. 



509 



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Sixteen sectors on one 

 side. 



Sixteen metal sectors 

 each side. 



Eight metal sectors each 

 side. 



Four metal sectors each 

 side. 



Two metal sectors each 

 side. 



Plain glass and no metal. 



g 



CO 



Is self-exciting. 



Alternations occur each £ revolu- 

 tion. 



Is more freely self-exciting. 

 Alternations occur each £ revolu- 

 tion. 



Is freely self-exciting with 3 revo- 

 lutions. 



Alternations occur each £ revo- 

 lution. 



Is self-exciting. 



Alternations occur each £ revolu- 

 tion. 



Is self-exciting. 



Alternations occur after each two 

 sectors pass brush. 



Is self-exciting with about 4 revo- 

 lutions. 



Alternations occur each £ revolu- 

 tion. 



O 



fcH 



P 



CD 



p. 



3 

 CD 

 ct- 



O 



Is self-exciting. 



Alternations occur each £ revolu- 

 tion. 



Is self-exciting. 



Alternations occur each £ revolu- 

 tion. 



Is more freely self-exciting. 



Alternations occur each £ revolu- 

 tion. 



Is self-exciting. 



Alternations occur each £ revolu- 

 tion. 



Is self-exciting. 



Alternations occur each £ revolu- 

 tion. 



Is self-exciting but requires care. 



Alternations occur each £ revolu- 

 tion. 



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3 

 SL 



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3 



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CD 



O 

 i-S 

 OB 



Is self-exciting when sectors are next 



the rod. 

 Is not self-exciting when sectors are next 



inductors. 

 Constant in either case. 



Is freely self-exciting. 

 Constant, but gives less current. 



Is self-exciting. 

 Constant current, 



Is self-exciting. 



Constant, but gives less current. 



Is self-exciting. 

 Constant current. 



Is not self-exciting but requires little 



assistance. 

 Constant current while not overtaxed ; 



gives large current. 



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