﻿44 
  Rowland 
  and 
  Penniman 
  — 
  Electrical 
  Measurements. 
  

  

  Condensers 
  2 
  and 
  3 
  Microfarads 
  in 
  Parallel. 
  

   ra=134, 
  ^=•0007 
  .-. 
  last 
  term 
  negligible. 
  

  

  

  

  

  

  

  Resis. 
  of 
  

  

  Resistance 
  

  

  

  

  

  

  

  R' 
  ciromt 
  

  

  due 
  to 
  

  

  R" 
  

  

  ^a 
  

  

  r 
  

  

  R' 
  

  

  R. 
  

  

  in 
  ohms. 
  

  

  absorption. 
  

  

  422-6 
  

  

  488-6 
  

  

  5457-3 
  

  

  347-9 
  

  

  39-29 
  

  

  33-77 
  

  

  5.30 
  

  

  1488-6 
  

  

  488-2 
  

  

  11 
  

  

  123-4 
  

  

  40-50 
  

  

  K 
  

  

  6-73 
  

  

  984-1 
  

  

  (1 
  

  

  a 
  

  

  82-1 
  

  

  40-72 
  

  

  33-81 
  

  

  6-91 
  

  

  2671-6 
  

  

  " 
  

  

  i( 
  

  

  22-5 
  

  

  41-116 
  

  

  " 
  

  

  7-30 
  

  

  423-0 
  

  

  " 
  

  

  (( 
  

  

  357-3 
  

  

  41-237 
  

  

  " 
  

  

  7-42 
  

  

  5474-3 
  

  

  « 
  

  

  (( 
  

  

  464-5 
  

  

  41-42 
  

  

  (( 
  

  

  7-61 
  

  

  6734- 
  

  

  11 
  

  

  " 
  

  

  374-9 
  

  

  41-67 
  

  

  (< 
  

  

  7-86 
  • 
  

  

  1 
  ohm 
  in 
  

  

  R"=f 
  scale 
  division. 
  

  

  

  

  u 
  

  

  

  7486- 
  

  

  " 
  

  

  " 
  

  

  638-6 
  

  

  41-64 
  

  

  " 
  

  

  7-83 
  

  

  9466- 
  

  

  K 
  

  

  a 
  

  

  81-15 
  

  

  41-85 
  

  

  (( 
  

  

  8-04 
  

  

  Condensers 
  2 
  and 
  3 
  placed 
  before 
  the 
  register 
  and 
  heated 
  for 
  

   1 
  hour 
  : 
  

  

  7489-7 
  488-27 
  " 
  713-8 
  46-534 
  34-33 
  12-20 
  

  

  After 
  standing 
  \\ 
  hours 
  in 
  air 
  at 
  temperature 
  of 
  12°*2 
  C. 
  

   condenser 
  has 
  been 
  open 
  so 
  that 
  resistances 
  have 
  been 
  cooled 
  : 
  

  

  12405 
  487-8 
  " 
  109- 
  42-86 
  34- 
  8-86 
  

  

  After 
  standing 
  some 
  little 
  time 
  : 
  

  

  7482-5 
  487-8 
  " 
  651-6 
  42-47 
  34' 
  8-49 
  

  

  The 
  above 
  table 
  shows 
  conclusively 
  the 
  heating 
  of 
  the 
  con- 
  

   denser 
  by 
  the 
  current, 
  and 
  the 
  dependence 
  of 
  the 
  absorption 
  

   upon 
  the 
  temperature. 
  

  

  Condensers 
  2 
  and 
  3 
  in 
  Parallel. 
  N=:57-6. 
  

  

  R" 
  

  

  

  R« 
  

  

  R' 
  

  

  r 
  

  

  % 
  

  

  R^ 
  in 
  

  

  ohms. 
  

  

  A. 
  

  

  348-5 
  

   7488- 
  

  

  3485- 
  

  

  

  488-6 
  

  

  u 
  

  

  396-3 
  

   849-2 
  

   844-1 
  

   3961 
  

  

  110207 
  

   4026- 
  

  

  55-61 
  

   55-41 
  

   55-07 
  

   55-58 
  

  

  33-77 
  

  

  21-84 
  

   21-64 
  

   21-30 
  

   21-81 
  

  

  N 
  = 
  

   3485- 
  

  

  56-6 
  

  

  per 
  second. 
  

   200-24 
  

  

  976-7 
  

  

  4026- 
  

  

  56-00 
  

  

  Average, 
  

  

  21-63 
  

   22-23 
  

  

  Comparing 
  these 
  values 
  with 
  those 
  found 
  in 
  the 
  use 
  of 
  

   method 
  25 
  the 
  agreement 
  is 
  at 
  once 
  apparent. 
  

  

  134- 
  

  

  131- 
  

  

  57-6 
  

  

  56-6 
  

  

  53- 
  

  

  Method 
  25 
  

  

  5-19 
  

  

  20-5 
  

  

  Direct 
  measure- 
  

   ment. 
  

  

  5-30 
  cold 
  

   7-00 
  warm 
  

  

  21-63 
  

  

  •23 
  

  

  It 
  should 
  be 
  remembered, 
  in 
  comparing 
  the 
  results, 
  that 
  the 
  

   values 
  obtained 
  by 
  Method 
  25 
  would 
  naturally 
  be 
  smaller 
  than 
  

   those 
  found 
  by 
  direct 
  measurement, 
  as 
  in 
  Method 
  25 
  the 
  cur- 
  

   rent 
  going 
  through 
  the 
  condensers 
  was 
  extremely 
  small 
  ; 
  there 
  

   was 
  therefore 
  practically 
  no 
  heating. 
  

  

  