﻿for 
  Higli 
  Frequency 
  Electrical 
  Oscillations* 
  799 
  

  

  § 
  6. 
  Comparison 
  of 
  Wavemeter 
  (A) 
  with 
  Standard 
  (B). 
  

  

  The 
  condenser 
  o£ 
  (A) 
  was 
  tested 
  throughout 
  its 
  range 
  by 
  

   Maxwell's 
  Commutator 
  Method 
  and 
  gave 
  the 
  results 
  shown 
  

   in 
  Table 
  III. 
  which 
  shows 
  the 
  scale 
  readings 
  to 
  be 
  very 
  nearly 
  

   proportional 
  to 
  the 
  capacity. 
  At 
  the 
  higher 
  readings 
  the 
  

   accuracy 
  of 
  measurement 
  o£ 
  K 
  is 
  here 
  of 
  the 
  order 
  o£ 
  2 
  or 
  3 
  

   parts 
  in 
  1000. 
  

  

  Table 
  III. 
  

  

  Reading. 
  

   Degrees. 
  

  

  K 
  

  

  mmfd. 
  

  

  K/Reading. 
  

  

  20 
  

  

  12(3 
  

  

  6-1 
  

  

  40 
  

  

  245 
  

  

  e-Oe 
  

  

  00 
  

  

  367 
  

  

  6.1, 
  

  

  80 
  

  

  486 
  

  

  6-08 
  

  

  100 
  

  

  607 
  

  

  6-07 
  

  

  120 
  

  

  724 
  

  

  6O3 
  

  

  140 
  

  

  851 
  

  

  6-0, 
  

  

  160 
  

  

  966 
  

  

  6-0^ 
  

  

  180 
  

  

  1075 
  

  

  5-9, 
  

  

  self 
  

  

  are 
  

  

  The 
  coils 
  (AI, 
  A5, 
  to 
  A9) 
  were 
  tested 
  for 
  

  

  inductance 
  (Lq) 
  at 
  ordinary 
  frequencies. 
  In 
  Table 
  TV 
  

   given 
  the 
  values 
  found 
  (including 
  the 
  working 
  circuit 
  in 
  

   each 
  case). 
  Approximate 
  dimensions 
  of 
  the 
  winding 
  are 
  also 
  

   given. 
  In 
  the 
  last 
  column 
  are 
  given 
  the 
  values 
  of 
  L^, 
  {i. 
  e. 
  

   the 
  value 
  of 
  the 
  self 
  inductance 
  for 
  infinite 
  frequency, 
  

  

  Table 
  IV. 
  

  

  Coil. 
  

  

  A4 
  

   A5 
  

  

  A6 
  

  

  A7 
  

   AS 
  

   A9 
  

  

  2 
  a 
  

  

  I 
  

  

  d 
  

  

  Coil 
  

  

  Axial 
  

  

  Wire 
  

  

  iameter. 
  

  

  Length. 
  

  

  Diameter 
  

  

  cm. 
  

  

  cm. 
  

  

  cm. 
  

  

  .5-2 
  

   80 
  

   5.1 
  

   51 
  

   7-6 
  

   7-6 
  

  

  10-7 
  

   11-3 
  

   5-6 
  

   9-6 
  

   5-3 
  

   8-9 
  

  

  0-32 
  

   0-32 
  

   0-09i 
  

   0-09i 
  

   OOSe 
  

   005, 
  

  

  N. 
  

   Turns. 
  

  

  Self 
  inductance, 
  

   microhenries. 
  

  

  1 
  

  

  1 
  

  

  Lo. 
  

  

  Loo. 
  

  

  32 
  

  

  21-6, 
  

  

  19-55 
  

  

  33 
  

  

  44-9,, 
  

  

  42-0 
  

  

  55 
  

  

  100-5 
  

  

  97-5 
  

  

  95 
  

  

  195-0 
  

  

  189-8 
  

  

  1 
  90 
  

  

  531-8 
  

  

  524 
  

  

  150 
  

  

  1039 
  

  

  1025 
  

  

  