﻿714 
  Prof. 
  E. 
  Taylor 
  Jones 
  and 
  Mr. 
  Morris 
  Owen 
  on 
  

  

  of 
  us 
  ■^. 
  This 
  was 
  connected 
  to 
  the 
  terminals 
  of 
  the 
  condenser 
  

   in 
  the 
  secondary 
  circuit 
  ; 
  the 
  photographs 
  obtained 
  therefore 
  

   represent 
  the 
  waves 
  of 
  potential 
  at 
  the 
  plates 
  of 
  this 
  condenser. 
  

  

  In 
  most 
  of 
  the 
  experiments 
  the 
  secondary 
  condenser 
  was 
  

   of 
  the 
  parallel- 
  plate 
  type 
  and 
  of 
  variable 
  capacity, 
  with 
  heavy 
  

   paraffin-oil 
  as 
  the 
  dielectric. 
  The 
  primary 
  capacity 
  consisted 
  

   of 
  a 
  paraffin-paper 
  condenser, 
  or 
  a 
  number 
  of 
  these 
  in 
  parallel. 
  

   In 
  all 
  cases 
  the 
  primary 
  coil 
  was 
  of 
  self-inductance 
  '004619 
  

   henry, 
  and 
  resistance 
  1*038 
  ohms 
  : 
  the 
  secondary 
  coil 
  had 
  self- 
  

   inductance 
  L2= 
  70*15 
  henry, 
  and 
  resistance 
  ^2 
  = 
  14022 
  ohms. 
  

   The 
  mutual 
  inductance 
  M 
  of 
  the 
  two 
  coils 
  was 
  *2192 
  henry. 
  

  

  The 
  carbons 
  used 
  for 
  the 
  arc 
  were 
  solid 
  and 
  9 
  mm. 
  in 
  

   diameter. 
  

  

  The 
  total 
  capacity 
  C2 
  in 
  the 
  secondary 
  circuit 
  includes 
  the 
  

   capacity 
  of 
  the 
  secondary 
  condenser, 
  of 
  the 
  oscillograph, 
  and 
  

   of 
  the 
  secondary 
  coil. 
  The 
  capacities 
  of 
  all 
  the 
  condensers 
  

   were 
  determined 
  by 
  measuring 
  the 
  periods 
  of 
  their 
  electrical 
  

   oscillations 
  when 
  connected 
  in 
  series 
  with 
  coils 
  of 
  known 
  

   self-inductance. 
  

  

  Full 
  details 
  as 
  to 
  the 
  methods 
  employed 
  in 
  the 
  determi- 
  

   nation 
  of 
  periods 
  of 
  oscillation 
  and 
  of 
  the 
  constants 
  of 
  the 
  

   circuits 
  were 
  given 
  in 
  the 
  previous 
  papers, 
  referred 
  to 
  above, 
  

  

  (1) 
  Resonance 
  of 
  the 
  Octave. 
  

  

  Case 
  I. 
  Ci 
  = 
  primary 
  capacity 
  = 
  9*55 
  microfarad. 
  

   02= 
  secondary 
  ,, 
  =*000275t 
  „ 
  

  

  This 
  case 
  was 
  referred 
  to 
  in 
  the 
  previous 
  paper 
  f, 
  where 
  it 
  

   was 
  pointed 
  out 
  that 
  the 
  octave, 
  which 
  is 
  generally 
  present 
  

   when 
  the 
  lower 
  arc 
  note 
  is 
  sounding, 
  becomes 
  in 
  this 
  case 
  

   very 
  much 
  intensified. 
  The 
  photograph 
  showing 
  this 
  was 
  also 
  

   given 
  in 
  the 
  paper 
  referred 
  to 
  §. 
  The 
  frequency 
  determined 
  

   from 
  the 
  photograph 
  was 
  613. 
  The 
  frequencies 
  calculated 
  

   from 
  the 
  inductances 
  of 
  the 
  coils, 
  and 
  the 
  capacities 
  of 
  the 
  

   condensers, 
  the 
  resistances 
  being 
  neglected, 
  were 
  1301*2 
  and 
  

   723*1, 
  which 
  do 
  not 
  satisfy 
  the 
  octave 
  relation 
  or 
  agree 
  with 
  

   the 
  observed 
  frequency. 
  

  

  In 
  order 
  to 
  find 
  the 
  influence 
  of 
  the 
  resistances 
  of 
  the 
  

   circuits 
  the 
  frequencies 
  Wi, 
  Wg 
  were 
  calculated 
  ibr 
  the 
  above 
  

   value 
  of 
  II2 
  and 
  for 
  various 
  values 
  of 
  Ri, 
  the 
  resistance 
  of 
  the 
  

  

  * 
  E. 
  T. 
  Jones, 
  Phil. 
  Mag. 
  ser. 
  6, 
  vol. 
  xiv. 
  p. 
  238, 
  Auoust 
  1907. 
  

  

  t 
  In 
  tlie 
  previous 
  paper 
  the 
  value 
  of 
  this 
  capacity 
  was 
  given 
  as 
  

   "about" 
  -000275 
  microfarad. 
  Subsequent 
  measurements 
  showed 
  that 
  

   this 
  value 
  is 
  correct 
  to 
  within 
  one 
  part 
  in 
  300. 
  

  

  X 
  L. 
  c. 
  p. 
  43. 
  

  

  § 
  L. 
  c. 
  Plate 
  I. 
  fig. 
  11.] 
  

  

  