﻿Flutinqs 
  in 
  a 
  Sound- 
  Wave. 
  

  

  \ng 
  

   make 
  them 
  air-tight. 
  

  

  477 
  

  

  sealed 
  around 
  to 
  make 
  tiiem 
  air-tight. 
  A 
  microscope 
  was 
  

   tbcussed 
  on 
  the 
  amorphous 
  silica 
  or 
  other 
  substance 
  used 
  for 
  

   flirtings. 
  When 
  the 
  sound-wave 
  was 
  established, 
  the 
  particles 
  

   of 
  amorphous 
  silica 
  could 
  be 
  seen 
  quickly 
  gathering 
  into 
  thin 
  

   laminae 
  which 
  would 
  either 
  sweep 
  out 
  of 
  fhe 
  field 
  of 
  view 
  or 
  

   move 
  about 
  in 
  the 
  field 
  with 
  irregular 
  motion. 
  

  

  Fig. 
  2. 
  

  

  As 
  the 
  number 
  of 
  vibrations 
  of 
  the 
  bar 
  was 
  1287*5 
  per 
  

   second, 
  and 
  the 
  amplitude 
  of 
  vibration 
  for 
  ordinary 
  bowing 
  

   0*2 
  mm., 
  the 
  only 
  means 
  by 
  which 
  a 
  vibration 
  of 
  the 
  laminae 
  

   could 
  have 
  been 
  detected 
  would 
  have 
  been 
  by 
  the 
  broadening 
  

   of 
  the 
  laminse, 
  and 
  this, 
  when 
  under 
  the 
  microscope, 
  was 
  such 
  

   a 
  heterogeneous 
  mass 
  of 
  moving 
  particles 
  that 
  no 
  vibration 
  

   could 
  be 
  detected. 
  The 
  study 
  became 
  very 
  interesting, 
  

   however, 
  in 
  watching 
  the 
  motion 
  of 
  the 
  individual 
  particles. 
  

   A 
  larger 
  particle 
  would 
  move 
  towards 
  a 
  smaller 
  particle 
  until 
  

   within 
  a 
  certain 
  distance, 
  when 
  the 
  small 
  particle 
  would 
  

   suddenly 
  move 
  away. 
  Again, 
  a 
  particle 
  might 
  be 
  swept 
  up 
  

   close 
  to 
  another 
  until 
  it 
  seemed 
  to 
  be 
  within 
  another 
  sphere 
  

   of 
  action, 
  and 
  be 
  drawn 
  to 
  it. 
  The 
  two 
  would 
  then 
  take 
  a 
  

   position 
  with 
  their 
  line 
  of 
  centres 
  transverse 
  to 
  the 
  stream- 
  

   lines. 
  Particles 
  lying 
  in 
  a 
  transverse 
  position 
  at 
  some 
  

   distance 
  apart 
  would 
  be 
  attracted, 
  always 
  assuming 
  the 
  

   laminal 
  condition. 
  It 
  was 
  noted, 
  however, 
  that 
  these 
  

   particles, 
  with 
  their 
  spheres 
  of 
  attraction 
  and 
  repulsion. 
  

   Phil. 
  Mag. 
  S. 
  6. 
  Vol. 
  3. 
  No. 
  17. 
  May 
  1902. 
  2 
  K 
  

  

  