on the Direct Current Corona. 



295 



ance connected. The axial wire was No. 20 copper 

 tightly stretched but it was easily set into violent vibra- 

 tions/ at 739 mm. pressure and 12,700 volts, within a few 

 seconds after closing the line switch. The applied poten- 

 tial fluctuated at times as much as 100 volts resulting m 



Fig. 10. 





CURRENT : 

 FOR PO! 



NCREASE W: 

 ITIVE STR] 



TH TIME 

 IAMERS 











































































10 

 SECONDS 



16 



20 



the more unsteady discharge. The water resistance has 

 the effect of damping out the smaller variations. 



The ease with which the arc formed was also noticed in 

 experiments with No. 20 wires strung parallel to each 

 other, spaced V/s inches apart and sealed into a 

 glass tube. 



While working with hydrogen it was noticed that when 

 the wire was at a given potential above the critical glow 



