﻿Interpretation 
  of 
  the 
  Bessel 
  Function 
  of 
  Zero 
  Order. 
  439 
  

  

  and 
  since 
  as 
  size 
  of 
  circle 
  of 
  sources 
  is 
  diminished, 
  strength 
  

   must 
  be 
  increased 
  to 
  keep 
  effect 
  finite, 
  qr 
  x 
  is 
  finite 
  = 
  A 
  say, 
  

   where 
  A 
  involves 
  time 
  factor 
  

  

  Again 
  (Macdonald, 
  § 
  36) 
  

  

  A 
  l 
  W 
  

   4:7TV 
  = 
  r— 
  ^ 
  —*- 
  , 
  

  

  r 
  sm 
  o 
  or 
  

   therefore 
  in 
  dielectric 
  

  

  JL 
  9J 
  -a 
  _ 
  1 
  °^ 
  

   V 
  2 
  "dt 
  ~ 
  ~~ 
  rsindor 
  ' 
  

  

  but 
  T/F 
  , 
  1 
  /sin 
  Kr 
  r 
  _ 
  \ 
  

  

  i,Dd 
  J_/Kr) 
  = 
  -1-g, 
  ( 
  - 
  sin 
  K, 
  - 
  ^Y 
  

  

  2 
  ~ 
  J 
  /irKr\ 
  Kr 
  /' 
  

  

  therefore 
  (29) 
  reduces 
  to 
  

  

  1 
  BY 
  A\/K 
  B 
  fisin.Kr 
  Tir 
  . 
  _ 
  cosKr") 
  

  

  ^5 
  ^— 
  = 
  . 
  =r— 
  -< 
  — 
  ^7 
  2 
  cos 
  Kr 
  — 
  sm 
  Hr 
  — 
  — 
  ^ 
  — 
  - 
  y 
  

  

  Y 
  2 
  ot 
  r 
  r\ 
  Kr 
  Kr 
  J 
  

  

  BY 
  VVKf 
  ^ 
  it 
  _lTT 
  --'ir 
  KsinKr 
  iKcosKr 
  

   0t 
  r 
  L 
  &r 
  Kr 
  

  

  i 
  sin 
  E> 
  cos 
  Kr- 
  

  

  + 
  

  

  , 
  2 
  | 
  

  

  Kr 
  2 
  T 
  Kr 
  

   V 
  2 
  AK*C 
  ~ 
  , 
  sinKr 
  oQsKr 
  , 
  ./, 
  _ 
  cosK> 
  

  

  _ 
  sin 
  Kr\| 
  

  

  from 
  which 
  we 
  see 
  that 
  amplitude 
  of 
  oscillation 
  of 
  normal 
  

   electric 
  force 
  at 
  any 
  point 
  in 
  the 
  dielectric 
  close 
  to 
  the 
  

   disk 
  is 
  

  

  Y 
  2 
  AK 
  

  

  ^r-Kv+wj 
  • 
  • 
  • 
  • 
  <&) 
  

  

  