﻿COHEN. 
  

  

  Phil. 
  Mag. 
  Ser. 
  6, 
  Vol. 
  16, 
  PL 
  XIX 
  

  

  Fig. 
  14. 
  

  

  i 
  it 
  I 
  if 
  

  

  Complex 
  Wate 
  Form. 
  

  

  Fig. 
  16. 
  

  

  (& 
  

  

  (« 
  

  

  Wave 
  Forms. 
  Modified 
  double 
  action 
  circuit. 
  

  

  