﻿574 
  Mr. 
  A. 
  B. 
  Kempe 
  on 
  the 
  production 
  of 
  [June 
  17, 
  

  

  is 
  a 
  fixed 
  point 
  on 
  A 
  D. 
  Thus 
  the 
  bar 
  S 
  T 
  may 
  be 
  replaced 
  by 
  either 
  of 
  

   the 
  bars 
  UY 
  orUW. 
  

  

  rig. 
  11. 
  

  

  § 
  12. 
  In 
  the 
  case 
  in 
  which 
  the 
  bar 
  S 
  T 
  is 
  employed 
  in 
  the 
  last 
  

   section, 
  make 
  

  

  a=b, 
  c=d, 
  k=~, 
  \=b, 
  

  

  and 
  make 
  T 
  coincide 
  with 
  A. 
  Then 
  

  

  C, 
  L, 
  P 
  coincide, 
  

  

  P, 
  c, 
  o 
  „ 
  

   A,T 
  

   B', 
  D 
  

   N,N' 
  

  

  and 
  the 
  bars 
  CD, 
  DO 
  are 
  equally 
  inclined 
  to 
  C 
  S 
  in 
  opposite 
  directions. 
  

  

  Fig. 
  12. 
  

  

  

  CLP 
  

  

  

  

  -f 
  

  

  

  \ 
  

  

  

  

  / 
  

  

  

  / 
  ! 
  

  

  

  ^ 
  / 
  

  

  

  / 
  

  

  

  \ 
  

  

  V 
  

  

  

  B 
  

  

  

  D 
  

  

  AT 
  

  

  

  This 
  linkwork 
  is 
  one 
  of 
  those 
  given 
  by 
  me 
  in 
  the 
  ' 
  Messenger.' 
  

  

  