﻿mi. 
  

  

  

  

  

  

  /\ 
  

  

  k 
  

  

  * 
  

  

  

  /-*>. 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  Phil. 
  Mag. 
  Ser. 
  6, 
  Vol. 
  26, 
  PI. 
  XXIV. 
  

  

  450 
  480 
  510 
  540 
  

  

  Fig. 
  4 
  b.— 
  SO,, 
  a/p 
  X/p 
  (5 
  to 
  90) 
  curve. 
  

   (1) 
  ^=2-84 
  mm. 
  (2) 
  p=20 
  mm. 
  (3) 
  p=16 
  mm. 
  

  

  •J 
  

  

  

  

  

  

  

  

  

  

  J 
  

  

  •09 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  •08 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  •07 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  )3 
  

  

  •06 
  

  

  

  

  

  

  

  

  

  

  o 
  

  

  

  

  

  

  

  

  

  

  

  •05 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  a 
  lp 
  

  

  

  

  

  

  

  

  

  

  

  •04 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  •03 
  

  

  

  

  

  

  

  

  

  tp23 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  5 
  

  

  

  

  •01 
  

  

  23 
  I 
  

  

  23j 
  

  

  2i 
  

  

  13 
  -J 
  

  

  32 
  

  

  13/ 
  

  

  

  

  

  10 
  £0 
  30 
  40 
  50 
  60 
  70 
  UQ 
  90 
  

  

  XJp 
  

  

  