﻿CI 
  

  

  c 
  J- 
  

  

  toioed 
  slightly 
  open 
  by 
  the 
  pres- 
  

   ence 
  of 
  the 
  inflowing 
  current 
  — 
  is 
  

   attached 
  to 
  the 
  lower 
  extremities 
  

   of 
  the 
  long 
  strips 
  or 
  pieces, 
  g 
  g, 
  //, 
  

   arranged 
  to 
  slide 
  upward 
  through 
  

   mortices 
  in 
  the 
  beam, 
  a. 
  The 
  lat- 
  

   ter, 
  in 
  turn, 
  is 
  provided 
  at 
  each 
  end 
  

   with 
  trunnions 
  litting 
  hjoseh^ 
  into 
  

   corresponding 
  sockets 
  in 
  the 
  up- 
  

   rights 
  p^ 
  p, 
  by 
  which 
  means 
  the 
  

   beam 
  and 
  its 
  dependent 
  parts 
  are 
  

   allowed 
  to 
  swing 
  readily 
  in 
  place, 
  

   as 
  indicated 
  by 
  the 
  i)ositions 
  of 
  the 
  

   gate 
  or 
  valve 
  in 
  tlie 
  several 
  dia- 
  

   grams. 
  

  

  Another 
  and 
  fixed 
  beam, 
  indi- 
  

   cated 
  at./", 
  serves 
  as 
  an 
  additional 
  

   support 
  to 
  the 
  uyaights, 
  p^ 
  p 
  ; 
  and 
  

   as 
  the 
  fulcrum 
  of 
  a 
  lever 
  by 
  means 
  

  

  