﻿Rowland 
  and 
  Penniman 
  — 
  Electrical 
  Measurements. 
  45 
  

  

  The 
  experiments 
  that 
  confirm 
  the 
  mathematical 
  theory 
  that 
  

   the 
  absorption 
  resistance 
  could 
  be 
  treated 
  as 
  ordinary 
  ohmic 
  

   resistance 
  were 
  performed 
  with 
  the 
  two 
  condensers, 
  -J 
  Troy 
  

   and 
  ^ 
  Elliott 
  microfarad 
  condensers. 
  These 
  are 
  next 
  given. 
  

  

  In 
  these 
  results 
  it 
  was 
  necessary 
  to 
  take 
  into 
  account, 
  in 
  the 
  

   calculation 
  of 
  the 
  apparent 
  value 
  of 
  R^, 
  the 
  last 
  term 
  of 
  the 
  

   equation, 
  that 
  is 
  

  

  7 
  R'(R" 
  + 
  RJ+WR' 
  + 
  R'') 
  

   ^ 
  Troy 
  and 
  ^ 
  Elliott 
  in 
  series, 
  1 
  o'clock. 
  

  

  Appareot 
  Ohmic 
  resist- 
  Absorption 
  

   value 
  ance 
  resistance 
  

  

  of 
  R. 
  A. 
  

  

  R" 
  R„ 
  R' 
  r 
  

  

  of 
  R, 
  

  

  4751-8 
  499-9 
  404-8 
  4^54" 
  

  

  43-141 
  

  

  1 
  Troy, 
  2 
  o'clock. 
  

  

  

  4750- 
  497-75 
  352-4 
  " 
  

  

  37-288 
  

  

  ■J 
  Elliott, 
  2.45 
  o'clock. 
  

  

  

  4749-3 
  497-67 
  390-3 
  

  

  41-260 
  

  

  -J 
  Troy 
  and 
  -J 
  Elliott 
  in 
  parallel, 
  

  

  4 
  o'clock. 
  

  

  4749-3 
  497-6 
  350-23 
  

  

  36-94 
  

  

  34-143 
  

  

  34-144 
  

  

  34-15 
  

  

  -J 
  Troy 
  and 
  -J 
  Elliott 
  in 
  series. 
  

  

  4748-5 
  497-55 
  418.15 
  " 
  44-612 
  34-12 
  10 
  

  

  998 
  

  

  144 
  

  

  116 
  

  

  79 
  

  

  492 
  

  

  Calculating 
  what 
  the 
  absorption 
  resistance 
  should 
  be 
  for 
  -J 
  

   Troy 
  and 
  ^ 
  Elliott 
  in 
  series, 
  from 
  the 
  absorption 
  resistances 
  of 
  

   the 
  two 
  condensers 
  when 
  determined 
  separately, 
  it 
  is 
  equal 
  to 
  

   10*26 
  ohms, 
  which 
  is 
  greater 
  than 
  the 
  first 
  and 
  less 
  than 
  the 
  last 
  

   value 
  above, 
  showing 
  that 
  the 
  condensers 
  were 
  heating 
  during 
  

   the 
  experiments. 
  Calculating 
  the 
  absorption 
  resistance 
  of 
  

   •J 
  Troy 
  and 
  ^ 
  Elliott 
  in 
  parallel 
  in 
  the 
  same 
  way, 
  it 
  is 
  equal 
  to 
  

   2*209 
  ohms, 
  which 
  is 
  less 
  than 
  the 
  value 
  afterwards 
  obtained 
  by 
  

   experiment 
  for 
  the 
  same 
  reason. 
  

  

  The 
  method 
  was 
  shown 
  not 
  to 
  be 
  based 
  on 
  any 
  false 
  suppo- 
  

   sition, 
  by 
  substituting 
  in 
  place 
  of 
  the 
  condenser 
  a 
  coil 
  of 
  

   known 
  self-inductance. 
  When 
  this 
  was 
  done 
  the 
  value 
  of 
  R^ 
  

   as 
  calculated 
  from 
  the 
  other 
  resistances 
  and 
  the 
  self-inductances 
  

   should 
  be 
  the 
  same 
  as 
  the 
  actual 
  ohmic 
  resistance 
  of 
  the 
  circuit. 
  

  

  This 
  was 
  tried 
  with 
  two 
  coils 
  P^ 
  and 
  A 
  and 
  the 
  agreement 
  

   was 
  remarkably 
  close, 
  as 
  seen 
  in 
  the 
  next 
  table. 
  

  

  Coil 
  P 
  used 
  in 
  place 
  of 
  condenser 
  in 
  the 
  R^ 
  circuit 
  : 
  

  

  

  Deduced 
  value 
  

  

  Actual 
  value 
  

  

  r 
  

  

  of 
  R, 
  

  

  of 
  R, 
  

  

  5457- 
  

  

  77-86 
  

  

  77-8 
  

  

  R" 
  R,, 
  R' 
  

  

  474-9 
  487-8 
  758-2 
  

  

  Coil 
  A 
  in 
  place 
  of 
  condenser 
  in 
  the 
  R^ 
  circuit 
  : 
  

  

  474-9 
  487-8 
  218*3 
  " 
  224-12 
  223-9 
  

  

  