﻿258 
  

  

  Mr. 
  L. 
  Vegard 
  : 
  Researches 
  upon 
  

  

  electrolysis 
  was 
  stopped. 
  The 
  experiment 
  had 
  the 
  result 
  

   shown 
  in 
  the 
  table. 
  

  

  Electrolysis 
  begun 
  10 
  h 
  30 
  m 
  a.m. 
  

  

  Temperature 
  11°3. 
  

  

  Temperature 
  1°0. 
  

  

  Time. 
  

  

  Resistance. 
  

  

  Time. 
  

  

  Resistance. 
  

  

  h 
  m 
  

   11 
  15 
  a.m. 
  

  

  11 
  50 
  „ 
  

  

  12 
  15 
  p.m. 
  

  

  12 
  34 
  „ 
  

  

  171 
  XlO 
  3 
  ohms. 
  

   192 
  „ 
  „ 
  

   19fi 
  „ 
  

   192 
  „ 
  

  

  h 
  ni 
  

  

  i 
  12 
  54 
  p.m. 
  

  

  ! 
  1 
  15 
  „ 
  

   1 
  30 
  ,, 
  

   1 
  45 
  „ 
  

   3 
  20 
  „ 
  

  

  310 
  XlO 
  3 
  ohms. 
  

   320 
  „ 
  

   314 
  „ 
  

   319 
  „ 
  

   27G 
  „ 
  

  

  12 
  44 
  p.m. 
  

  

  El. 
  stopped. 
  

  

  It 
  appears 
  from 
  the 
  table 
  that 
  the 
  resistance 
  on 
  lowering 
  

   the 
  temperature 
  rose 
  from 
  192 
  to 
  310 
  thousand 
  ohms. 
  As 
  

   the 
  electrolysis 
  had 
  been 
  stopped 
  during 
  the 
  interval, 
  this 
  

   increase 
  cannot 
  be 
  due 
  to 
  any 
  building 
  up 
  of 
  the 
  membrane. 
  

   On 
  the 
  contrary, 
  the 
  resistance 
  will 
  fall 
  with 
  time, 
  but 
  this 
  

   will 
  only 
  cause 
  a 
  diminution 
  in 
  the 
  effect, 
  and 
  we 
  see 
  that 
  the 
  

   resistance 
  at 
  the 
  low 
  temperature 
  first 
  increases 
  for 
  some 
  time. 
  

   As 
  resistances 
  that 
  most 
  nearly 
  correspond 
  to 
  the 
  same 
  

   system 
  we 
  should 
  also 
  this 
  time 
  have 
  to 
  take 
  the 
  maximum 
  

   resistances. 
  

  

  If 
  in 
  the 
  experiment 
  with 
  the 
  cells 
  M 
  and 
  A 
  we 
  assume 
  

   that 
  the 
  maximum 
  resistances 
  at 
  the 
  two 
  temperatures 
  corre- 
  

   spond 
  to 
  nearly 
  equal 
  membranes, 
  the 
  temperature 
  effect 
  

   calculated 
  from 
  the 
  maximum 
  values 
  should 
  nearly 
  give 
  the 
  

   temperature 
  coefficient 
  corresponding 
  to 
  a 
  constant 
  system* 
  

   When 
  the 
  temperature 
  effect 
  is 
  defined 
  in 
  the 
  usual 
  way, 
  the 
  

   two 
  experiments 
  give 
  the 
  following 
  result 
  : 
  — 
  

  

  Cell. 
  

  

  Temperature 
  Coefficient. 
  

  

  M 
  

  

  -0072 
  

  

  -0-063 
  

  

  . 
  

  

  A 
  

  

  

  Since 
  continuing 
  the 
  electrolysis 
  after 
  maximum 
  we 
  

   generally 
  get 
  some 
  decrease 
  in 
  the 
  resistance, 
  the 
  value 
  found 
  

   for 
  cell 
  M 
  will 
  be 
  somewhat 
  too 
  large 
  and 
  the 
  value 
  for 
  A 
  

   too 
  small 
  ; 
  and 
  we 
  see 
  that 
  the 
  temperature 
  effect 
  found 
  is 
  

   greater 
  for 
  cell 
  M 
  than 
  for 
  cell 
  A. 
  The 
  temperature 
  effect 
  

  

  