﻿570 
  Prof. 
  J. 
  S. 
  Townsend 
  on 
  the 
  Conductivity 
  

  

  The 
  pressure 
  at 
  which 
  a 
  is 
  a 
  maximum 
  for 
  a 
  given 
  force 
  X 
  

   is 
  obtained 
  by 
  differentiating 
  the 
  equation 
  a=pfl 
  — 
  With 
  

   respect 
  to 
  p 
  ; 
  we 
  thus 
  obtain 
  

  

  so 
  that 
  j^ 
  is 
  proportional" 
  to 
  X. 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  \i 
  r 
  

  

  i 
  

  

  

  

  

  

  

  

  

  

  N>V 
  X 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  ^x 
  

  

  

  

  

  

  

  

  \ 
  

  

  

  

  

  

  \ 
  d 
  

  

  

  

  

  1 
  

  

  

  \ 
  

  

  \<*\ 
  

  

  

  O 
  

  

  v\ 
  X 
  

  

  ""k. 
  

  

  

  

  ! 
  

  

  

  

  \ 
  

  

  

  

  o^ 
  

  

  V\ 
  

  

  

  

  

  

  

  

  c 
  

  

  £s 
  

  

  

  of 
  

  

  \\ 
  

  

  

  

  

  

  

  

  

  

  

  to\ 
  

  

  

  

  

  

  

  

  

  

  F 
  *\ 
  

  

  

  

  \ 
  

  

  

  

  

  

  

  

  

  

  ^ 
  

  

  V 
  

  

  

  

  

  

  

  

  

  ^ 
  

  

  

  A 
  

  

  

  

  

  

  

  

  

  

  

  W\( 
  

  

  

  

  

  

  

  

  

  

  

  trfy 
  

  

  

  

  

  

  

  

  

  

  

  

  

  •I- 
  

  

  CO 
  © 
  

  

  O 
  CO 
  CD 
  

  

  