﻿Anomalous 
  Conduction 
  in 
  a 
  Solid 
  Dielectric. 
  

  

  679 
  

  

  that 
  law. 
  A, 
  B, 
  C 
  are 
  three 
  parallel 
  plates. 
  The 
  distance 
  

   between 
  A 
  and 
  C 
  was 
  about 
  2 
  mm., 
  and 
  that 
  between 
  B 
  and 
  

   C 
  about 
  1*2 
  cm. 
  Gr 
  and 
  H 
  are 
  guard-rings. 
  The 
  plates 
  A 
  

   and 
  B 
  were 
  about 
  6*5 
  cm. 
  in 
  diameter. 
  The 
  space 
  between 
  

  

  Fig. 
  1. 
  

  

  the 
  plates 
  was 
  filled 
  with 
  paraffin-wax 
  which 
  was 
  run 
  in 
  hot 
  

   while 
  the 
  plates 
  themselves 
  were 
  held 
  in 
  a 
  specially 
  con- 
  

   structed 
  vessel 
  which 
  served 
  to 
  hold 
  them 
  in 
  position. 
  The 
  

   narrow 
  sides 
  of 
  the 
  vessel 
  were 
  of 
  glass 
  so 
  that 
  one 
  could 
  

   look 
  through, 
  and 
  remove 
  any 
  air-bubbles. 
  I£ 
  air-bubbles 
  

   are 
  present, 
  slow 
  discharge 
  is 
  apt 
  to 
  take 
  place 
  across 
  them 
  

   until 
  both 
  sides 
  are 
  at 
  the 
  same 
  potential, 
  thus 
  causing 
  

   irregularities 
  in 
  the 
  readings. 
  As 
  an 
  additional 
  precaution 
  

   the 
  wax 
  was 
  heated 
  for 
  some 
  time 
  to 
  about 
  110° 
  0. 
  and 
  

   subjected 
  to 
  a 
  vacuum 
  before. 
  being 
  used. 
  

  

  The 
  letters 
  assigned 
  to 
  the 
  different 
  plates 
  in 
  fig. 
  1 
  will 
  

   be 
  adhered 
  to 
  throughout 
  the 
  paper. 
  A 
  side 
  view 
  of 
  the 
  

   apparatus 
  is 
  shown 
  to 
  the 
  right 
  of 
  the 
  figure. 
  J 
  is 
  a 
  metal 
  

   ring 
  which 
  fitted 
  over 
  the 
  side 
  of 
  the 
  apparatus 
  and 
  kept 
  it 
  

   at 
  zero 
  potential. 
  A 
  rod 
  D 
  from 
  the 
  centre 
  plate 
  ended 
  just 
  

   above 
  the 
  circumference 
  of 
  the 
  guard-ring, 
  and 
  was 
  com- 
  

   pletely 
  enclosed 
  in 
  the 
  paraffin- 
  wax 
  protuberance 
  E. 
  (These 
  

   parts 
  for 
  convenience 
  are 
  not 
  shown 
  in 
  the 
  right-hand 
  

   figure.) 
  A 
  very 
  fine 
  hole 
  in 
  the 
  protuberance 
  enabled 
  a 
  

   piece 
  of 
  thin 
  wire 
  to 
  be 
  pushed 
  down 
  so 
  as 
  to 
  make 
  connexion 
  

   to 
  the 
  rod 
  attached 
  to 
  the 
  plate, 
  and 
  in 
  this 
  way 
  the 
  latter 
  

   could 
  be 
  charged. 
  The 
  fine 
  wire 
  was 
  immediately 
  removed 
  

  

  2Z2 
  

  

  