Edison Effect in Glow Lamps. 79 



The results in Table No. 11 are plotted in curve No. 5. 



This table shows that when the lamp is kept at a constant 

 voltage the current through the galvanometer jumps from 

 one value to another. The fluctuation of the current takes 

 place when the negative leg of the carbon is the one farthest 



Table No. 11.— Curve No. 5. 



4-0 



3-0 



25 



g3 



1-0 



■ " " 1 



pill HIM IIHIIM 





BHHHHU 



HI 

 11 



■■■■■■■■ 





: | ; | 





flBKBKBB 



. 









■■ 



x 5 



r<t^ 



^f^' 





'ik^r^ffui 





30 32 34 36 38 40 42 44 

 Working Volts of Lamp. 



from the plate. When the leg adjacent to the aluminium 

 plate is the negative one then the current is steady at any 

 definite voltage of the lamp. 



§ 15. From the above experiments it is clear that the 

 current obtained when a galvanometer is connected between a 

 metallic plate and the positive electrode of the lamp is greater 



