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  DESCRIPTION 
  OF 
  AN 
  ELECTRICAL 
  MACHINE 
  

  

  deemed 
  necessary 
  to 
  insulate 
  the 
  cushions 
  and 
  the 
  axis, 
  as 
  in 
  the 
  electrical 
  

   plate 
  machine 
  which 
  I 
  employ 
  for 
  experiments 
  requiring 
  insulation.* 
  

  

  The 
  prime 
  conductor 
  is 
  supported 
  and 
  insulated 
  by 
  means 
  of 
  wooden 
  

   posts 
  covered 
  by 
  stout 
  bell 
  glasses, 
  so 
  that 
  the 
  summits 
  of 
  the 
  latter 
  are 
  

   between 
  those 
  of 
  the 
  posts 
  and 
  the 
  inner 
  surfaces 
  of 
  caps 
  attached 
  to 
  

   the 
  conductor. 
  By 
  these 
  means 
  the 
  glass 
  is 
  subjected 
  to 
  pressure, 
  but 
  

   is 
  liable 
  to 
  no 
  strain. 
  Such 
  a 
  support 
  combines 
  the 
  advantages 
  both 
  of 
  

   wood 
  and 
  glass. 
  At 
  C 
  C, 
  are 
  the 
  collectors. 
  R 
  represents 
  a 
  sliding 
  

   rod, 
  which 
  may 
  be 
  drawn 
  out 
  to 
  such 
  an 
  extent 
  as 
  to 
  be 
  brought 
  in 
  

   contact 
  with 
  any 
  apparatus 
  placed 
  under 
  it 
  upon 
  the 
  table. 
  

  

  In 
  fact, 
  the 
  large 
  rod 
  in 
  which 
  the 
  rod 
  R 
  slides 
  may 
  be 
  slipped 
  up 
  

   to 
  any 
  elevation 
  through 
  the 
  hole 
  in 
  the 
  brass 
  ball 
  which 
  sustains 
  it. 
  

  

  DR. 
  HARE'S 
  BATTERY 
  DISCHARGER 
  FOR 
  DEFLAGRATING 
  WIRES. 
  

  

  This 
  apparatus 
  is 
  employed 
  by 
  me 
  in 
  lieu 
  of 
  Henley's 
  universal 
  

   discharger 
  ; 
  being 
  better 
  adapted 
  to 
  my 
  apparatus, 
  and 
  mode 
  of 
  ope- 
  

  

  * 
  See 
  Silliman's 
  American 
  Journal 
  of 
  Science 
  for 
  1828, 
  vol. 
  7, 
  page 
  108 
  ; 
  or 
  London 
  

   Philosophical 
  Magazine 
  for 
  1823, 
  vol. 
  23, 
  page 
  8. 
  

  

  