﻿DlJDDELL. 
  

  

  Phi]. 
  Mag, 
  Ser. 
  6, 
  Yol. 
  16. 
  PL 
  XV. 
  

  

  P.D. 
  and 
  Current 
  Wave-Forms 
  of 
  Short 
  Sparks. 
  

  

  Fig. 
  7. 
  — 
  Spark-length 
  30 
  mm. 
  

  

  Zero 
  line 
  

   ior 
  Current. 
  

  

  P.D. 
  Wave-Form 
  not 
  recorded. 
  

  

  Fig. 
  8. 
  — 
  Distance 
  between 
  electrodes 
  too 
  great 
  for 
  

   sparking 
  to 
  take 
  place. 
  

  

  Zero 
  line 
  

   for 
  Current. 
  

  

  Zero 
  line 
  

   for 
  P.D. 
  

  

  