﻿698 
  Prof. 
  J. 
  Trowbridge 
  on 
  

  

  through 
  a 
  large 
  resistance 
  of 
  running 
  water 
  B. 
  The 
  dis- 
  

   charging 
  circuit 
  included 
  an 
  adjustable 
  self-induction 
  I, 
  a 
  

  

  Fisr. 
  1. 
  

  

  tube 
  filled 
  with 
  rarefied 
  hydrogen 
  T, 
  and 
  a 
  spark 
  S. 
  K 
  was 
  

   an 
  iron 
  electrode 
  with 
  an 
  orifice 
  two 
  millimetres 
  in 
  diameter 
  

   at 
  its 
  centre, 
  a 
  glass 
  tube 
  welded 
  to 
  the 
  sides 
  of 
  the 
  tube 
  

   entered 
  this 
  orifice. 
  The 
  end 
  of 
  the 
  tube 
  C 
  was 
  coated 
  with 
  

   willemite. 
  

  

  At 
  first 
  I 
  studied 
  the 
  effect 
  of 
  increasing 
  the 
  self-induction 
  

   on 
  the 
  admittance 
  of 
  the 
  mixture 
  of 
  anode 
  and 
  cathode 
  rays 
  

   to 
  the 
  region 
  C. 
  The 
  phosphorescence 
  on 
  the 
  screen 
  at 
  the 
  

   end 
  of 
  the 
  tube 
  was 
  observed 
  with 
  a 
  spectrophotometer 
  and 
  

   also 
  with 
  a 
  photometer 
  consisting 
  of 
  crossed 
  Nicol 
  prisms. 
  

  

  Ficr. 
  2. 
  

  

  

  In 
  fig. 
  2 
  the 
  intensity 
  of 
  light 
  is 
  plotted 
  along 
  the 
  axis 
  

   of 
  Y, 
  and 
  the 
  wave-lengths 
  of 
  the 
  circuit 
  along 
  X. 
  The 
  

  

  