﻿Farwell 
  — 
  An 
  Optical 
  Bench 
  for 
  Elementary 
  Work. 
  473 
  

  

  Art. 
  XLI. 
  — 
  An 
  Optical 
  Bench 
  for 
  Elementary 
  Work; 
  by 
  

   H. 
  "W*. 
  Farwell. 
  

  

  The 
  ordinary 
  type 
  of 
  optical 
  bench 
  found 
  in 
  elementary 
  lab- 
  

   oratories 
  usually 
  consists 
  of 
  a 
  meter 
  stick 
  supported 
  in 
  wooden 
  

   holders, 
  with 
  fittings 
  for 
  lenses, 
  etc., 
  of 
  sheet 
  metal 
  bent 
  to 
  

   slide 
  on 
  the 
  meter 
  stick. 
  These 
  fittings 
  offer 
  little 
  opportunity 
  

   for 
  small 
  adjustments 
  which 
  are 
  frequently 
  necessary 
  for 
  the 
  

  

  fl 
  

  

  Stale 
  

  

  1 
  inch. 
  

  

  success 
  of 
  the 
  work. 
  In 
  addition, 
  frequent 
  bending 
  of 
  the 
  

   slides 
  to 
  make 
  them 
  fit 
  the 
  meter 
  stick 
  causes 
  a 
  large 
  mortal- 
  

   ity 
  in 
  fittings. 
  To 
  make 
  our 
  elementary 
  work 
  in 
  light 
  more 
  

   successful 
  the 
  type 
  of 
  bench 
  described 
  below 
  has 
  been 
  devised. 
  

   The 
  meter 
  stick 
  as 
  before 
  is 
  the 
  base 
  of 
  the 
  apparatus, 
  

   (though 
  we 
  are 
  now 
  using 
  sticks 
  two 
  meters 
  long). 
  This 
  is 
  

   supported 
  by 
  two 
  rather 
  heavy 
  supports, 
  A, 
  shown 
  in 
  the 
  

  

  