﻿THE 
  

   LONDON, 
  EDINBURGH, 
  and 
  DUBLIN 
  

  

  PHILOSOPHICAL 
  MAGAZINE 
  

  

  AND 
  

  

  JOURNAL 
  OF 
  SCIENCE. 
  

  

  [SIXTH 
  SERIES.] 
  <n 
  

  

  FEBRUARY 
  1918. 
  

  

  

  XVI. 
  Continued 
  Discussion 
  of 
  the 
  Astronomical 
  and 
  Gravi- 
  

   tational 
  Bearings 
  of 
  the 
  Electrical 
  Theory 
  of 
  Matter. 
  By 
  

   Sir 
  Oliver 
  Lodge 
  *. 
  

  

  Part 
  I. 
  

  

  MY 
  short 
  summary 
  in 
  the 
  December 
  number 
  of 
  the 
  

   Phil. 
  Mag., 
  page 
  519, 
  put 
  prominently 
  forward 
  the 
  

   idea 
  that 
  the 
  expected 
  effect 
  required 
  that 
  the 
  additional 
  

   inertia 
  due 
  to 
  motion 
  should 
  be 
  independent 
  of 
  gravitative 
  

   influence; 
  for 
  the 
  conclusion 
  seemed 
  obvious 
  that 
  if 
  weight 
  

   and 
  mass 
  varied 
  together 
  there 
  would 
  be 
  no 
  change 
  in 
  accele- 
  

   ration, 
  and 
  that 
  in 
  that 
  case 
  it 
  did 
  not 
  matter 
  how 
  much 
  the 
  

   mass 
  of 
  a 
  revolving 
  body 
  varied. 
  But 
  I 
  soon 
  perceived 
  that 
  

   this 
  was 
  only 
  attending 
  to 
  the 
  transverse 
  acceleration 
  and 
  

   neglecting 
  the 
  longitudinal, 
  which 
  is 
  taken 
  into 
  account 
  in 
  

   Professor 
  Eddington's 
  completer 
  theory 
  in 
  the 
  October 
  

   number 
  of 
  the 
  Phil. 
  Mag., 
  page 
  322. 
  He 
  there 
  re-deter- 
  

   mines 
  the 
  fundamental 
  equation 
  of 
  particle 
  dynamics, 
  with 
  

   momentum 
  a 
  function 
  of 
  speed, 
  and 
  shows 
  that 
  not 
  the 
  ratio 
  

   F/m, 
  but 
  the 
  product 
  Fra, 
  enters 
  into 
  the 
  absolute 
  term 
  of 
  

  

  that 
  equation, 
  so 
  that 
  it 
  becomes 
  -r^ 
  + 
  u 
  = 
  ' 
  o 
  — 
  . 
  

   ^ 
  dd 
  2 
  h 
  2 
  u 
  2 
  ran 
  

  

  I 
  take 
  up 
  the 
  thread 
  again 
  here, 
  and 
  point 
  out 
  that 
  that 
  

   being 
  so, 
  the 
  unexpected 
  result 
  follows, 
  that 
  if 
  the 
  additional 
  

   inertia 
  is 
  acted 
  on 
  by 
  gravity, 
  in 
  accordance 
  with 
  the 
  ordinary 
  

  

  * 
  Communicated 
  by 
  the 
  Author. 
  

   Phil 
  Mag, 
  S. 
  6. 
  Vol. 
  35. 
  No. 
  20(5. 
  Feb. 
  1918. 
  M 
  

  

  