﻿654 
  

  

  Prof. 
  S. 
  B. 
  McLaren 
  

  

  on 
  a 
  

  

  These 
  conditions 
  introduce 
  an 
  aether-pressure 
  as 
  well 
  as 
  

   a 
  pressure 
  in 
  matter. 
  

  

  When 
  the 
  motion 
  of 
  the 
  aether 
  is 
  varied, 
  it 
  may 
  be 
  shown 
  

   that 
  

  

  A 
  

  

  ClT, 
  

  

  7 
  (J 
  **.)= 
  - 
  v(p.+ 
  AB»- 
  g»A 
  

  

  dv 
  

  

  — 
  m(A7r)^dv 
  a 
  ds 
  c 
  

  

  A 
  

   dr 
  

  

  ?(-£**•)- 
  - 
  s(*» 
  + 
  1^~ 
  **)*>*• 
  

  

  y 
  ■ 
  (47) 
  

  

  + 
  m(4*)*^«Mv 
  

  

  The 
  equations 
  (47) 
  indicate 
  that 
  the 
  transfer 
  of 
  momentum 
  

   is 
  effected 
  by 
  an 
  aether-pressure 
  p 
  a 
  , 
  and 
  that 
  a 
  force 
  on 
  aether 
  

  

  Stt 
  

  

  V 
  (H 
  2 
  -E 
  2 
  ) 
  

  

  acts 
  per 
  unit 
  volume. 
  The 
  last 
  terms 
  on 
  the 
  right 
  of 
  the 
  

   equations 
  (47) 
  correspond 
  simply 
  to 
  the 
  rate 
  of 
  loss 
  of 
  

   momentum 
  due 
  to 
  the 
  aether 
  which 
  has 
  dropped 
  out, 
  they 
  

   are 
  in 
  form 
  equivalent 
  to 
  a 
  frictional 
  force 
  proportional 
  to 
  

   the 
  velocity. 
  By 
  (42) 
  there 
  disappears 
  the 
  amount 
  of 
  aether 
  

  

  (4:7r)imdv 
  a 
  ds 
  a 
  , 
  

  

  per 
  unit 
  time 
  taking 
  with 
  it 
  the 
  momentum 
  

  

  dr 
  a 
  

  

  (47r)*m 
  -T^dv 
  a 
  ds 
  a 
  

  

  which 
  appears 
  on 
  the 
  right 
  of 
  (47). 
  

   Remembering 
  (42) 
  write 
  (47) 
  

  

  £&"< 
  

  

  07T 
  

  

  

  (48) 
  

  

  And 
  now 
  (48) 
  leads 
  to 
  conclusions 
  of 
  the 
  same 
  kind 
  con- 
  

   cerning 
  vortex-motion 
  and 
  pressure 
  as 
  we 
  deduced 
  for 
  the 
  

   motion 
  of 
  matter 
  from 
  (34). 
  Instead 
  of 
  (35) 
  we 
  have 
  now 
  

  

  