﻿18 
  Prof. 
  H. 
  Nagaoka 
  on 
  the 
  Diffraction 
  Phenomena 
  in 
  the 
  

  

  Beplacing 
  p 
  and 
  6 
  by 
  the 
  values 
  already 
  given, 
  we 
  obtain 
  

   for 
  an 
  internal 
  point 
  

  

  • 
  +JlVPT?J) 
  ( 
  1+ 
  ^))_i 
  J5 
  

  

  a 
  I' 
  

  

  = 
  ===== 
  l 
  s 
  near] 
  y, 
  

  

  n 
  2>Sa{a-8) 
  ' 
  

  

  = 
  I 
  f 
  " 
  l 
  [J 
  2 
  ( 
  ^sm^t 
  2 
  ) 
  + 
  Ji 
  2 
  ( 
  ^^tb 
  ] 
  <« 
  

  

  T 
  „_ 
  a 
  c 
  h 
  Jq 
  2 
  ( 
  n/^+F) 
  + 
  Ji 
  2 
  ( 
  vg^+F) 
  ~ 
  

  

  When 
  the 
  point 
  is 
  external 
  to 
  the 
  circle, 
  

  

  where 
  

   I' 
  

  

  -L> 
  = 
  

  

  y 
  

  

  it 
  2\/a(a 
  + 
  8) 
  

  

  Fig. 
  7. 
  

  

  + 
  1/' 
  nearly. 
  

  

  7T 
  

  

  X 
  = 
  d 
  

  

  

  * 
  Jo 
  £ 
  2 
  +S 
  2 
  

  

  3/ 
  = 
  - 
  

  

  