﻿APPARATUS, 
  OR 
  MANIPULATION. 
  

  

  405 
  

  

  each 
  trough 
  to 
  revolve 
  on 
  one 
  of 
  the 
  two 
  ends 
  of 
  a 
  strap 
  of 
  sheet 
  cop- 
  

   per. 
  To 
  connect 
  with 
  the 
  termination 
  of 
  the 
  series, 
  the 
  leaden 
  rods, 
  

   to 
  which 
  are 
  soldered 
  the 
  vices, 
  or 
  spring 
  forceps, 
  for 
  holding 
  the 
  sub- 
  

   stances 
  to 
  be 
  exposed 
  to 
  the 
  deflagrating 
  power, 
  one 
  end 
  of 
  each 
  of 
  the 
  

   lead 
  rods 
  is 
  soldered 
  to 
  a 
  piece 
  of 
  sheet 
  copper. 
  The 
  pieces 
  of 
  copper, 
  

   thus 
  soldered 
  to 
  the 
  lead 
  rods, 
  are 
  then 
  to 
  be 
  placed 
  under 
  the 
  pivots, 
  

   which 
  are 
  of 
  course 
  to 
  be 
  connected 
  with 
  the 
  termination 
  of 
  the 
  series. 
  

   The 
  last 
  mentioned 
  connexion 
  is 
  conveniently 
  made 
  by 
  means 
  of 
  straps 
  

   of 
  copper, 
  severally 
  soldered 
  to 
  the 
  pivots 
  and 
  the 
  poles 
  of 
  the 
  series, 
  

   and 
  screwed 
  together 
  by 
  a 
  hand-vice. 
  Each 
  pair 
  consists 
  of 
  a 
  copper 
  

   and 
  a 
  zinc 
  plate, 
  soldered 
  together 
  at 
  the 
  upper 
  edge, 
  where 
  the 
  copper 
  

   is 
  made 
  to 
  embrace 
  the 
  edge 
  of 
  the 
  zinc. 
  The 
  three 
  remaining 
  edges 
  

   are 
  made 
  to 
  enter 
  a 
  groove 
  in 
  the 
  wood, 
  being 
  secured 
  therein 
  by 
  ce- 
  

   ment. 
  For 
  each 
  inch 
  in 
  the 
  length 
  of 
  the 
  trough 
  there 
  are 
  three 
  pairs. 
  

   In 
  the 
  series 
  represented 
  by 
  Fig. 
  1, 
  there 
  are 
  seven 
  hundred 
  pairs 
  of 
  

   seven 
  inches 
  by 
  three 
  ; 
  in 
  that 
  represented 
  by 
  Fig. 
  2, 
  one 
  hundred 
  

   pairs 
  of 
  fourteen 
  inches 
  by 
  eight. 
  The 
  latter 
  will 
  deflagrate 
  wires 
  too 
  

   large 
  to 
  be 
  ignited 
  by 
  the 
  other, 
  but 
  is 
  less 
  powerful 
  in 
  producing 
  a 
  jet 
  

   of 
  flame 
  between 
  the 
  charcoal 
  points, 
  or 
  in 
  giving 
  a 
  shock. 
  

  

  Fig. 
  2. 
  

  

  Galvanic 
  Deflagrator 
  of 
  seven 
  hundred 
  pairs, 
  of 
  seven 
  inches 
  by 
  three. 
  

   VOL. 
  V. 
  — 
  5 
  D 
  

  

  