﻿Improved 
  Form 
  of 
  Magnetometer, 
  155 
  

  

  Wo 
  

  

  Q. 
  

  

  n 
  

   r 
  

  

  "W 
  

  

  IS 
  

  

  El 
  

  

  •• 
  J 
  

  

  ID 
  

  

  3 
  

  

  