﻿332 
  Prof. 
  H. 
  A. 
  Erikson 
  on 
  the 
  Recoynhination 
  of 
  

  

  The 
  value 
  o£ 
  each 
  deflexion 
  in 
  volts 
  was 
  obtained 
  from 
  a 
  

   potentiometer, 
  a 
  cadmium 
  cell 
  being 
  used 
  as 
  the 
  standard. 
  

  

  The 
  lowest 
  temperature 
  was 
  obtained 
  by 
  immersing 
  the 
  

   chamber 
  in 
  liquid-air. 
  The 
  next 
  higher 
  temperature 
  was 
  

   obtained 
  by 
  packing 
  CO2 
  snow 
  about 
  the 
  chamber, 
  the 
  liquid- 
  

   air 
  tube 
  being 
  used 
  as 
  the 
  containing 
  vessel. 
  

  

  Temperatures 
  higher 
  than 
  that 
  of 
  the 
  room 
  were 
  obtained 
  

   by 
  inverting 
  the 
  chamber 
  and 
  heating 
  it 
  by 
  means 
  of 
  a 
  

   concentric 
  electric 
  coil, 
  the 
  whole 
  being 
  imbedded 
  in 
  dry 
  

   sand. 
  

  

  Results, 
  

  

  In 
  order 
  to 
  show 
  the 
  magnitude 
  of 
  the 
  different 
  quantities 
  

   involved, 
  a 
  set 
  of 
  observations 
  with 
  their 
  substitution 
  in 
  the 
  

   expression 
  for 
  a 
  is 
  here 
  given. 
  

  

  Time 
  in 
  seconds 
  required 
  for 
  the 
  leaf 
  to 
  move 
  10 
  divisions 
  

   ( 
  = 
  •611 
  volt) 
  : 
  

  

  10, 
  10, 
  9-9, 
  10-2, 
  10-1, 
  10, 
  10, 
  10, 
  10, 
  Av. 
  = 
  10. 
  

  

  Thei 
  deflexion 
  in 
  scale- 
  divisions 
  due 
  to 
  charge 
  CiVi 
  : 
  

  

  23-6, 
  24-4, 
  24-5, 
  24-4, 
  24-3, 
  23-8, 
  23-8,24-2, 
  24-4, 
  24-6, 
  24*5, 
  

   Av. 
  = 
  24-23 
  ( 
  = 
  1-56 
  volts). 
  

  

  = 
  J(5-84 
  + 
  l-55)(5-842-l-552)(47r--561) 
  = 
  710. 
  

  

  (C^C0y 
  ^ 
  (700 
  + 
  47)-771 
  _l__ 
  

   ^ 
  T3U0^ 
  10 
  300^"^^' 
  

  

  (6 
  = 
  3-4x10-10). 
  

  

  (l-60-l-37)747 
  12;J1^_ 
  

  

  O 
  5-64 
  y 
  10^ 
  

  

  « 
  = 
  K^^=710^j:g,^-^^^^2=710x4-82^ 
  = 
  34206 
  = 
  l-16xl0-«. 
  

  

  In 
  the 
  following 
  Tables 
  are 
  given 
  all 
  the 
  results 
  obtained 
  

   up 
  to 
  the 
  present 
  time. 
  

  

  