﻿and 
  of 
  Electrification 
  on 
  the 
  Re-formation 
  of 
  Clouds. 
  455 
  

  

  The 
  fact 
  that 
  vapours 
  of 
  various 
  substances, 
  e. 
  g. 
  sulphuric 
  

   acid, 
  form 
  clouds 
  in 
  moist 
  air 
  is 
  well 
  known, 
  and 
  1 
  do 
  not 
  

   propose 
  to 
  make 
  any 
  attempt 
  to 
  describe 
  previous 
  work 
  

   connected 
  with 
  this 
  subject. 
  

  

  As 
  J. 
  S. 
  Townsend 
  has 
  shown 
  *, 
  the 
  oxygen 
  and 
  hydrogen 
  

   evolved 
  by 
  the 
  electrolysis 
  of 
  dilute 
  sulphuric 
  acid 
  or 
  caustic 
  

   potash 
  solutions 
  are 
  electrified, 
  and 
  also 
  form 
  clouds 
  in 
  presence 
  

   of 
  moisture. 
  These 
  clouds 
  can 
  be 
  destroyed 
  by 
  bubbling 
  

   through 
  sulphuric 
  acid 
  and 
  reappear 
  on 
  passing 
  into 
  water 
  

   without 
  much 
  loss 
  of 
  charge. 
  Gases 
  evolved 
  in 
  certain 
  

   chemical 
  reactions 
  behave 
  in 
  a 
  similar 
  manner 
  (see 
  Townsend, 
  

   loc. 
  cit. 
  and 
  also 
  Enright, 
  Phil. 
  Mag., 
  1890). 
  

  

  The 
  gases 
  evolved 
  by 
  electrolysis 
  or 
  by 
  the 
  action 
  of 
  acids 
  

   on 
  metals 
  carry 
  with 
  them 
  a 
  spray 
  of 
  the 
  solution 
  in 
  which 
  

   they 
  are 
  formed, 
  and 
  previous 
  experimenters 
  have 
  arrived 
  at 
  

   different 
  conclusions 
  with 
  regard 
  to 
  the 
  part 
  played 
  by 
  this 
  

   spray 
  in 
  the 
  above 
  phenomena. 
  

  

  Jn 
  the 
  papers 
  referred 
  to 
  above, 
  Townsend 
  arrives 
  at 
  the 
  

   conclusion 
  that 
  the 
  formation 
  of 
  the 
  clouds 
  in 
  the 
  newly 
  - 
  

   prepared 
  gases 
  is 
  probably 
  an 
  electrical 
  phenomenon, 
  and 
  is 
  

   not 
  the 
  result 
  of 
  the 
  presence 
  in 
  the 
  gas 
  of 
  spray. 
  

  

  Another 
  view 
  is 
  that 
  the 
  spray 
  of 
  acid 
  condenses 
  moisture 
  

   on 
  itself, 
  so 
  forming 
  the 
  clouds, 
  and 
  that 
  the 
  electric 
  charge 
  

   in 
  the 
  gas 
  does 
  not 
  have 
  any 
  important 
  effect 
  on 
  the 
  formation 
  

   of 
  the 
  clouds. 
  

  

  The 
  apparatus 
  I 
  employed 
  is 
  shown 
  in 
  the 
  accompanying 
  

   figure. 
  It 
  consisted 
  of 
  a 
  Gouy 
  sprayer 
  S, 
  which 
  was 
  worked 
  

   by 
  the 
  air 
  supplied 
  by 
  a 
  water-pump 
  P. 
  

  

  * 
  " 
  On 
  Electricity 
  in 
  Gases 
  and 
  the 
  Formation 
  of 
  Clouds 
  in 
  Charged 
  

   Gases," 
  Proc. 
  Camb. 
  Phil. 
  Soc. 
  vol. 
  ix. 
  pts. 
  v. 
  & 
  vii. 
  

  

  