﻿432 
  Mr. 
  C. 
  A. 
  Chant 
  : 
  An 
  Experimental 
  Investigation 
  

  

  to 
  A 
  and 
  B, 
  the 
  terminals 
  of 
  the 
  secondary 
  of 
  the 
  coil. 
  The 
  glass 
  

   tubes 
  passed 
  through 
  openings 
  in 
  the 
  mirror 
  M 
  and 
  the 
  box. 
  

  

  Fig-. 
  2. 
  

  

  OSCILLATOR 
  

  

  By 
  this 
  arrangement 
  a 
  pair 
  of 
  cylinders 
  could 
  be 
  removed 
  

   and 
  another 
  pair 
  substituted 
  for 
  them 
  while 
  the 
  connexions 
  

   remained 
  precisely 
  the 
  same. 
  

  

  The 
  spark-gap 
  was 
  always 
  the 
  same 
  for 
  the 
  cylinders, 
  

   being 
  about 
  0*7 
  mm. 
  long. 
  

  

  The 
  spherical 
  oscillators 
  were 
  of 
  the 
  Righi 
  pattern. 
  The 
  

   spheres 
  C, 
  D 
  (fig. 
  3) 
  were 
  held 
  in 
  circular 
  disks 
  of 
  hard 
  

  

  Fia-. 
  3 
  

  

  Fig-. 
  4. 
  

  

  rubber, 
  in 
  which 
  openings 
  had 
  been 
  turned 
  to 
  receive 
  them, 
  

   by 
  melting 
  paraffin 
  about 
  them. 
  The 
  smaller 
  knobs 
  K, 
  K 
  

   were 
  on 
  the 
  ends 
  of 
  jointed 
  rods 
  R, 
  R 
  which 
  were 
  held 
  in 
  

   hard 
  rubber 
  rods 
  N, 
  N 
  rigidly 
  fastened 
  to 
  the 
  disks 
  carrying 
  

   the 
  spheres. 
  By 
  this 
  means 
  the 
  knobs 
  could 
  be 
  adjusted 
  to 
  

   the 
  spheres, 
  and 
  would 
  remain 
  so 
  when 
  the 
  spheres 
  were 
  

   adjusted 
  to 
  each 
  other. 
  To 
  allow 
  this 
  latter 
  to 
  be 
  done, 
  one 
  

   disk 
  was 
  held 
  to 
  the 
  horizontal 
  support 
  beneath 
  by 
  a 
  screw 
  

   passing 
  up 
  through 
  the 
  support 
  into 
  it, 
  while 
  the 
  other 
  could 
  

   be 
  slid 
  along 
  the 
  support 
  by 
  a 
  screw. 
  The 
  entire 
  arrange- 
  

   ment 
  is 
  shown 
  in 
  fig. 
  4. 
  The 
  spheres 
  were 
  of 
  three 
  sizes. 
  

  

  