﻿for 
  High 
  Frequency 
  Electrical 
  Oscillations. 
  801 
  

  

  From 
  Table 
  VI. 
  it 
  will 
  be 
  seen 
  that 
  the 
  observed 
  effective 
  

   values 
  of 
  L 
  (to 
  be 
  used 
  in 
  working 
  the 
  instrument) 
  lie 
  

   between 
  L^ 
  and 
  L^^ 
  in 
  all 
  cases 
  but 
  the 
  last. 
  The 
  discrepancy 
  

   here 
  may 
  be 
  due 
  to 
  an 
  error 
  of 
  0"5 
  per 
  cent, 
  in 
  determining 
  

   n 
  which 
  might 
  occur 
  in 
  consequence 
  of 
  the 
  reduced 
  sensi- 
  

   tivity 
  when 
  using 
  a 
  coil 
  of 
  such 
  high 
  resistance 
  as 
  A 
  9. 
  

  

  The 
  column 
  headed 
  L„ 
  gives 
  the 
  values 
  of 
  L 
  calculated 
  

   from 
  L^ 
  for 
  the 
  actual 
  values 
  of 
  n 
  by 
  means 
  of 
  Cbhen's 
  

   formula 
  *. 
  It 
  will 
  be 
  noticed 
  that 
  this 
  brings 
  the 
  observed 
  

   and 
  the 
  calculated 
  values 
  of 
  the 
  inductances 
  (at 
  the 
  high 
  

   frequencies) 
  considerably 
  closer. 
  

  

  Table 
  YI. 
  

  

  Coil. 
  

  

  j 
  Effective 
  L. 
  

  

  L«. 
  

  

  Lo. 
  

  

  Loo- 
  

  

  A4 
  

  

  .J 
  19-9 
  

  

  19-6 
  

  

  21-6, 
  

  

  19-5.5 
  

  

  1 
  A5 
  

  

  .J 
  42-5.3 
  

  

  42-1 
  

  

  44-9e 
  

  

  420 
  

  

  i 
  AG 
  

  

  ..: 
  99-1 
  

  

  98-1 
  

  

  100-5 
  

  

  97-5 
  

  

  A7 
  

  

  ..; 
  191-2 
  

  

  190-8 
  

  

  195-0 
  

  

  189-8 
  

  

  A8 
  

  

  ..: 
  531 
  

  

  526 
  

  

  531-8 
  

  

  524 
  

  

  A9 
  

  

  .; 
  104, 
  

  

  1029 
  

  

  1039 
  

  

  1025 
  

  

  § 
  7. 
  Conclusion. 
  

  

  Thus 
  it 
  appears 
  that 
  within 
  the 
  limits 
  of 
  wave-length 
  used, 
  

   the 
  wavemeter 
  with 
  coils 
  of 
  well 
  stranded 
  wire 
  gave 
  results 
  

   in 
  close 
  agreement 
  with 
  theory, 
  while 
  in 
  the 
  case 
  of 
  the 
  

   instrument 
  with 
  coils 
  of 
  solid 
  wire 
  the 
  agreement 
  was 
  as 
  close 
  

   as 
  could 
  be 
  expected, 
  as 
  the 
  correcting 
  formulas 
  are 
  only 
  

   strictly 
  applicable 
  to 
  long 
  solenoids. 
  

  

  In 
  conclusion 
  I 
  would 
  express 
  my 
  best 
  thanks 
  for 
  kind 
  

   assistance 
  to 
  Major 
  O^Meara 
  and 
  his 
  staff 
  ; 
  to 
  Prof. 
  R. 
  LI. 
  

   Jones, 
  Messrs. 
  H. 
  C. 
  Booth 
  and 
  T. 
  L. 
  Eckersley, 
  who 
  

   skilfully 
  aided 
  in 
  the 
  experiments 
  ; 
  and 
  to 
  Dr. 
  Glazebrook 
  

   for 
  valued 
  help 
  and 
  advice 
  throughout 
  the 
  work. 
  

  

  * 
  Bulletin, 
  Bureau 
  of 
  Standards, 
  vol. 
  iv., 
  no. 
  1, 
  p. 
  177 
  (1907). 
  

  

  