﻿220 Mr. J. A. Brown on the Potential required 



Figr. 7. 



0-6 



0-5 



ft 0-4 



p 



\ 















,'® 











/ 



• 



/ 

 • 











• 



/ 

 / 

 / 



• 













/ 









1 03 

 0-2 

 01 









/ 





































ioo aoo 



300 



4-00 500 < 





X 







Table I. 



Deter 



initiation of - • 





d = l. 



P 



p = , 17 mm 





Sp. V.- 281 volts. 



— =36o. 





a - = 3'5. 



P 





P 



a =2-54. 





£=0-26. 





P 



0-35. 





d=l. 





p = 0-58 mm 





Sp. Y. = 374 



— = b4o. 





"=3-6. 



P 





JP 



a =2-09. 





^=0-37. 



6Q0 700 



/8 



= 0-638. 



