﻿Bast:. 
  

  

  Phil. 
  Mag. 
  Ser. 
  6, 
  Vol. 
  35, 
  PL 
  III. 
  

  

  The 
  Diffraction 
  of 
  Light 
  by 
  a 
  Cylinder 
  of 
  radius 
  1/54 
  cm. 
  

  

  