﻿IN 
  INCREASING 
  THE 
  INTENSITY 
  OF 
  ELECTRICITY. 
  229 
  

  

  itself, 
  which 
  I 
  do 
  not 
  recollect 
  to 
  have 
  seen 
  mentioned, 
  although 
  it 
  is 
  

   intimately 
  connected 
  with 
  the 
  facts 
  of 
  Magneto-Electricity, 
  as 
  well 
  as 
  

   with 
  the 
  subject 
  of 
  these 
  investigations, 
  viz. 
  When 
  the 
  body 
  is 
  made 
  to 
  

   form 
  a 
  part 
  of 
  a 
  galvanic 
  circuit 
  composed 
  of 
  a 
  number 
  of 
  elements, 
  a 
  

   shock 
  is, 
  of 
  course, 
  felt 
  at 
  the 
  moment 
  of 
  completing 
  the 
  circuit. 
  If 
  

   the 
  battery 
  be 
  not 
  very 
  large, 
  little 
  or 
  no 
  effect 
  will 
  be 
  perceived 
  dur- 
  

   ing 
  the 
  uninterrupted 
  circulation 
  of 
  the 
  galvanic 
  current; 
  but 
  if 
  the 
  

   circuit 
  be 
  interrupted 
  by 
  breaking 
  the 
  contact 
  at 
  any 
  point, 
  a 
  shock 
  

   will 
  be 
  felt 
  at 
  the 
  moment, 
  nearly 
  as 
  intense 
  as 
  that 
  given 
  when 
  the 
  

   contact 
  was 
  first 
  formed. 
  The 
  secondary 
  shock 
  is 
  rendered 
  more 
  evi- 
  

   dent, 
  when 
  the 
  battery 
  is 
  in 
  feeble 
  action, 
  by 
  placing 
  in 
  the 
  mouth 
  the 
  

   end 
  of 
  one 
  of 
  the 
  wires 
  connected 
  with 
  the 
  poles 
  ; 
  a 
  shock 
  and 
  flash 
  of 
  

   light 
  will 
  be 
  perceived 
  when 
  the 
  circuit 
  is 
  completed, 
  and 
  also 
  the 
  

   same 
  when 
  the 
  contact 
  is 
  broken 
  at 
  any 
  point, 
  but 
  nothing 
  of 
  the 
  kind 
  

   will 
  be 
  perceived 
  in 
  the 
  intermediate 
  time, 
  although 
  the 
  circuit 
  may 
  

   continue 
  uninterrupted 
  for 
  some 
  minutes. 
  This 
  I 
  consider 
  an 
  import- 
  

   ant 
  fact 
  in 
  reference 
  to 
  the 
  action 
  of 
  the 
  voltaic 
  current. 
  

  

  The 
  phenomena 
  described 
  in 
  this 
  paper 
  appear 
  to 
  be 
  intimately 
  con- 
  

   nected 
  with 
  those 
  of 
  Magneto-Electricity, 
  and 
  this 
  opinion 
  I 
  advanced 
  

   with 
  the 
  announcement 
  of 
  the 
  first 
  fact 
  of 
  these 
  researches 
  in 
  the 
  

   American 
  Journal 
  of 
  Science. 
  They 
  may, 
  I 
  conceive, 
  be 
  all 
  referred 
  

   to 
  that 
  species 
  of 
  dynamical 
  Induction 
  discovered 
  by 
  Mr 
  Faraday, 
  which 
  

   produces 
  the 
  following 
  phenomenon, 
  namely: 
  when 
  two 
  wires, 
  A 
  and 
  

   B, 
  are 
  placed 
  side 
  by 
  side, 
  but 
  not 
  in 
  contact, 
  and 
  a 
  voltaic 
  current 
  is 
  

   passed 
  through 
  A, 
  there 
  is 
  a 
  current 
  produced 
  in 
  B, 
  but 
  in 
  an 
  opposite 
  

   direction. 
  The 
  current 
  in 
  B 
  exists 
  only 
  for 
  an 
  instant, 
  although 
  the 
  

   current 
  in 
  A 
  may 
  be 
  indefinitely 
  continued 
  ; 
  but 
  if 
  the 
  current 
  in 
  A 
  be 
  

   stopped, 
  there 
  is 
  produced 
  in 
  B 
  a 
  second 
  current, 
  in 
  an 
  opposite 
  direc- 
  

   tion 
  however 
  to 
  the 
  first 
  current. 
  

  

  The 
  above 
  fundamental 
  fact 
  in 
  Magneto-Electricity 
  appears 
  to 
  me 
  

   to 
  be 
  a 
  direct 
  consequence 
  of 
  the 
  statical 
  principles 
  of 
  "Electrical 
  

   Induction''' 
  as 
  mathematically 
  investigated 
  by 
  Cavendish, 
  Poisson 
  and 
  

   others. 
  When 
  the 
  two 
  wires 
  A 
  and 
  B 
  are 
  in 
  their 
  natural 
  state, 
  an 
  equi- 
  

   librium 
  is 
  sustained 
  by 
  the 
  attractions 
  and 
  repulsions 
  of 
  the 
  two 
  fluids 
  

   in 
  each 
  wire 
  ; 
  or, 
  according 
  to 
  the 
  theory 
  of 
  Franklin 
  and 
  Cavendish, 
  by 
  

   the 
  attractions 
  and 
  repulsions 
  of 
  the 
  one 
  fluid, 
  and 
  the 
  matter 
  of 
  the 
  two 
  

   vol. 
  v.— 
  3 
  H 
  

  

  