﻿Fig. 
  2. 
  — 
  Apparatus 
  and 
  accessories. 
  

  

  Fig. 
  3. 
  — 
  Frequency 
  about 
  (500,000. 
  Receiving 
  end 
  open. 
  

  

  Fig. 
  4. 
  — 
  Frequency 
  about 
  1,140,000. 
  Receiving 
  end 
  open. 
  

  

  Fig. 
  5. 
  — 
  Frequency 
  about 
  1,800,000. 
  Receiving 
  end 
  open. 
  

  

  