﻿Conductivity 
  imparted 
  to 
  Liquid 
  Air 
  by 
  Alpha 
  Rays. 
  

  

  883 
  

  

  A 
  polonium-coated 
  copper 
  plate 
  about 
  1 
  sq. 
  cm. 
  in 
  area 
  

   was 
  attached 
  in 
  this 
  case 
  to 
  AB, 
  that 
  portion 
  of 
  the 
  plate 
  

   CABD 
  which 
  lay 
  within 
  the 
  opening 
  in 
  FE 
  with 
  its 
  active 
  

   face 
  towards 
  GH 
  and 
  with 
  its 
  surface 
  in 
  the 
  plane 
  of 
  EF. 
  

  

  Fur. 
  3. 
  

  

  To 
  Eio.tte.ny 
  

  

  With 
  this 
  arrangement 
  CABD 
  acted 
  as 
  an 
  electrode 
  and 
  EF 
  

   as 
  a 
  guard-plate 
  for 
  it. 
  The 
  supports 
  to 
  these 
  plates 
  were 
  

   heavy 
  copper 
  wires 
  about 
  60 
  cm. 
  in 
  length. 
  One 
  of 
  them, 
  

   KG, 
  was 
  surrounded 
  with 
  a 
  tube 
  of 
  clear 
  fused 
  quartz, 
  and 
  

   the 
  others, 
  LF 
  and 
  MGr, 
  with 
  tubes 
  of 
  glass. 
  In 
  making 
  the 
  

   measurements 
  the 
  wire 
  L 
  was 
  kept 
  connected 
  to 
  earth, 
  the 
  

   wire 
  M 
  joined 
  to 
  a 
  battery 
  of 
  storage-cells, 
  and 
  the 
  terminal 
  

   K 
  to 
  the 
  free 
  quadrants 
  of 
  the 
  electrometer. 
  The 
  distance 
  

   between 
  AB 
  and 
  GH 
  was 
  about 
  5 
  mm. 
  The 
  capacity 
  of 
  the 
  

   system, 
  including 
  the 
  electrode 
  AB, 
  the 
  free 
  quadrants, 
  and 
  

   tiie 
  leading 
  wires, 
  was 
  in 
  this 
  case 
  about 
  200 
  e.s.u. 
  

  

  A 
  number 
  of 
  sets 
  of 
  readings 
  was 
  taken 
  with 
  this 
  apparatus 
  

   of 
  the 
  conductivity 
  impressed 
  on 
  the 
  liquid 
  air 
  by 
  the 
  rays 
  

   from 
  polonium, 
  and 
  these 
  readings 
  all 
  gave 
  curves 
  similar 
  to 
  

   those 
  shown 
  in 
  fig. 
  2. 
  One 
  set 
  of 
  readings 
  taken 
  in 
  this 
  way 
  

   is 
  given 
  in 
  Table 
  III. 
  and 
  a 
  curve 
  representing 
  it 
  is 
  shown 
  in 
  

   fig. 
  4 
  (PI. 
  XVI 
  II.). 
  The 
  shape 
  of 
  this 
  curve, 
  it 
  will 
  be 
  seen, 
  

   is 
  practically 
  the 
  same 
  as 
  that 
  shown 
  in 
  fig. 
  2. 
  

  

  3 
  02 
  

  

  