﻿Transformations 
  of 
  X-Ra^s. 
  

  

  127 
  

  

  I£ 
  the 
  values 
  of 
  k 
  for 
  each 
  tertiary 
  radiator 
  are 
  plotted 
  as 
  

   ordinates 
  against 
  the 
  absorption 
  coefficients 
  by 
  aluminium 
  of 
  

   the 
  exciting 
  secondary 
  beams 
  as 
  abscissae, 
  we 
  obtain 
  the 
  

   graphs 
  shown 
  in 
  tig. 
  4. 
  

  

  Fi-. 
  4. 
  

  

  c50 
  

  

  eOO 
  150 
  100 
  50 
  

  

  /iBSORPf/ON 
  CoErf/CJ^AfTS 
  Br 
  /^l>. 
  

  

  If 
  X2 
  be 
  the 
  value' 
  of 
  the 
  absorption 
  coefficient 
  by 
  Al 
  of 
  

   the 
  characteristic 
  homogeneous 
  radiation 
  from 
  any 
  substance 
  

   A 
  and 
  Xi 
  that 
  of 
  the 
  exciting 
  radiation 
  (also 
  homogeneous), 
  

  

  