﻿202 
  

  

  Trowhridge— 
  Investigation 
  of 
  the 
  Coherer. 
  

  

  examination. 
  Unless 
  a 
  potential 
  difference 
  between 
  the 
  termi- 
  

   nals 
  of 
  the 
  coherer 
  of 
  at 
  least 
  this 
  value 
  is 
  produced 
  by 
  the 
  

   electromagnetic 
  disturbance, 
  no 
  coherer 
  action 
  will 
  take 
  place. 
  

   Probably 
  every 
  coherer 
  has 
  a 
  critical 
  value 
  of 
  the 
  potential 
  

   difference 
  peculiar 
  to 
  itself, 
  a 
  coherer 
  with 
  a 
  low 
  value 
  being 
  

   preferable 
  for 
  telegraphic 
  purposes. 
  Owing 
  to 
  lack 
  of 
  time 
  

   I 
  have 
  not 
  been 
  able 
  to 
  experiment 
  with 
  more 
  than 
  one 
  

   coherer. 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  kfY. 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  1 
  

  

  

  i 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

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  / 
  

  

  

  

  1 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  1 
  

  

  

  

  1 
  

  

  

  

  

  i 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  f 
  

  

  

  

  

  

  1 
  ■ 
  

  

  

  

  1 
  

  

  

  / 
  

  

  

  1 
  

  

  

  

  r 
  

  

  J 
  

  

  

  

  

  

  / 
  

  

  

  

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  / 
  

  

  4.V. 
  

  

  

  

  

  

  

  

  

  

  

  

  / 
  

  

  

  

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  / 
  

  

  / 
  

  

  

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  1' 
  i 
  

  

  

  

  

  

  

  

  

  / 
  

  

  

  

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  / 
  

  

  

  

  /siv 
  . 
  

  

  1 
  

  

  

  / 
  

  

  

  1 
  

  

  

  

  

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  ^;\ 
  

  

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  :}A 
  

  

  p 
  — 
  1 
  — 
  

  

  

  1 
  

  

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  /. 
  

  

  y- 
  

  

  

  ! 
  

  

  

  T. 
  

  

  / 
  

  

  

  

  y 
  

  

  /o 
  

  

  ^ 
  

  

  ^ 
  

  

  / 
  

  

  

  1^ 
  

  

  ,^ 
  

  

  y 
  

  

  

  

  

  

  ^ 
  

  

  y 
  

  

  

  :^ 
  

  

  t:!^ 
  

  

  t=^ 
  

  

  

  

  

  

  =*=^ 
  

  

  

  

  

  

  

  

  

  005 
  0-1 
  

  

  When 
  we 
  inquire 
  into 
  the 
  nature 
  of 
  the 
  discharge 
  through 
  

   the 
  coherer 
  which 
  produces 
  a 
  lowering 
  of 
  resistance, 
  the 
  ques- 
  

   tion 
  arises 
  as 
  to 
  whether 
  or 
  not 
  it 
  is 
  of 
  an 
  oscillatory 
  character. 
  

  

  From 
  the 
  theory 
  of 
  the 
  oscillatory 
  discharge 
  of 
  a 
  condenser, 
  

   we 
  have 
  a 
  term 
  

  

  |/^ 
  

  

  ■' 
  — 
  4 
  

  

  entering 
  into 
  the 
  expression 
  for 
  the 
  current 
  strength 
  I, 
  where 
  

   r 
  is 
  the 
  resistance 
  of 
  the 
  discharge 
  circuit 
  and 
  L 
  and 
  C 
  respec- 
  

  

  