﻿Canal 
  Rays 
  from 
  Hollow 
  Cathodes. 
  

  

  183 
  

  

  magnetic 
  field 
  of 
  moderate 
  strength. 
  If 
  the 
  electromagnet 
  is 
  

   placed 
  near 
  to 
  the 
  point 
  where 
  the 
  red 
  rajs 
  cut 
  the 
  glass 
  

  

  Fig. 
  22. 
  

  

  

  wall, 
  the 
  cathode 
  rays 
  will 
  be 
  collected 
  into 
  a 
  sharp 
  blue 
  

   beam 
  turning, 
  by 
  a 
  suitable 
  motion 
  of 
  the 
  electromagnet, 
  

   round 
  the 
  surface 
  of 
  a 
  cone 
  whose 
  vortex 
  lies 
  in 
  the 
  red 
  

   beam. 
  

  

  In 
  conclusion 
  I 
  wish 
  to 
  express 
  my 
  heartiest 
  thanks 
  to 
  

   Professor 
  J. 
  J. 
  Thomson 
  for 
  his 
  kind 
  interest 
  and 
  suggestive 
  

   help 
  throughout 
  the 
  course 
  of 
  this 
  research, 
  which 
  was 
  carried 
  

   out 
  in 
  the 
  Cavendish 
  Laboratory. 
  

  

  Cambridge, 
  5th 
  March, 
  1908. 
  

  

  