﻿172 
  Dr. 
  J. 
  Kunz 
  on 
  Catliode 
  and 
  

  

  separated 
  by 
  a 
  dark 
  space. 
  On 
  the 
  side 
  toward 
  the 
  poles 
  of 
  

   the 
  bulb 
  each 
  part 
  is 
  accompanied 
  by 
  a 
  small 
  strip 
  ot 
  phos- 
  

   phorescence. 
  

  

  Fiar. 
  10. 
  

  

  Very 
  beautiful 
  geometrical 
  figures 
  of 
  phosphorescence 
  are 
  

   obtained 
  when 
  the 
  cross 
  section 
  of 
  the 
  hollow 
  cathodic 
  tube 
  

   is 
  not 
  spherical 
  but 
  of 
  any 
  other 
  shape. 
  In 
  the 
  case^of 
  

   a 
  triangular 
  tube 
  I 
  found 
  a 
  central 
  cross, 
  a 
  bright 
  spot.at 
  

   each 
  end 
  and 
  in 
  the 
  middle 
  of 
  each 
  side, 
  and 
  a 
  phosphorescent 
  

  

  Fitr. 
  11. 
  

  

  4 
  

  

  boundary 
  of 
  the 
  triangle 
  connecting 
  with 
  the 
  cathode, 
  as 
  

   indicated 
  in 
  fur. 
  11. 
  

  

  