﻿170 
  On 
  a 
  Bijilar 
  Vibration 
  Galvanometer. 
  

  

  to 
  1900, 
  though 
  the 
  wires 
  are 
  rather 
  too 
  loose 
  below 
  100-^ 
  

   per 
  second. 
  

  

  Fig. 
  2. 
  

  

  2000 
  

  

  2 
  4 
  6 
  8 
  10 
  IS. 
  I4< 
  16 
  

  

  "Free 
  Lcnqth 
  of 
  T'Vi'res 
  — 
  C 
  entimetues. 
  

  

  Fig. 
  3, 
  

  

  As 
  the 
  damping 
  in 
  this 
  instrument 
  is 
  very 
  small 
  the 
  

   resonance 
  is 
  very 
  sharp. 
  Figs. 
  4 
  and 
  5 
  show 
  the 
  amplitude 
  

  

  