﻿Transformations 
  of 
  X-Bai/s. 
  

  

  123 
  

  

  following 
  manner. 
  A 
  flat 
  plate 
  of 
  aluminium, 
  of 
  the 
  same 
  

   size 
  as 
  the 
  required 
  radiator, 
  was 
  covered 
  with 
  a 
  thin 
  layer 
  of 
  

  

  Fiff. 
  8. 
  

  

  4-0 
  

  

  3 
  

  

  

  Ct^ 
  

  

  / 
  

  

  ^ 
  

  

  / 
  

  

  

  

  

  ^ 
  

  

  <^ 
  Ni 
  

  

  5Q 
  60 
  70 
  

  

  /fr. 
  lYT. 
  or 
  /f/iD/flTO/f 
  

  

  adhesive 
  (previously 
  tested 
  and 
  found 
  to 
  emit 
  no 
  detectable 
  

   radiation 
  of 
  the 
  homogeneous 
  type), 
  and 
  then 
  the 
  metals, 
  finely 
  

   powdered, 
  were 
  pressed 
  into 
  this 
  layer, 
  the 
  surface 
  being 
  

   covered 
  with 
  powdered 
  metal. 
  A 
  sample 
  radiator 
  prepared 
  

   with 
  pure 
  iron 
  filings 
  in 
  this 
  way 
  emitted 
  a 
  tertiary 
  radiation 
  

   indistinguishable 
  (by 
  absorption 
  tests) 
  from 
  that 
  produced 
  

   from 
  a 
  plate 
  of 
  the 
  metal. 
  This, 
  however, 
  is 
  quite 
  to 
  be 
  

   expected 
  since 
  practically 
  the 
  whole 
  of 
  the 
  tertiary 
  radiation 
  

   from 
  iron 
  is 
  obtained 
  from 
  a 
  layer 
  '003 
  cm. 
  thick. 
  

  

  But 
  the 
  value 
  of 
  R 
  for 
  a 
  prepared 
  plate 
  of 
  iron 
  filings 
  is 
  a 
  

   little 
  less 
  than 
  that 
  for 
  a 
  flat 
  polished 
  plate 
  of 
  iron 
  of 
  equal 
  

   size 
  placed 
  in 
  an 
  identical 
  position, 
  owing 
  to 
  the 
  irregularities 
  

   of 
  the 
  surface 
  reducing 
  the 
  effective 
  area. 
  Three 
  equal 
  

   prepared 
  plates 
  of 
  Co, 
  Fe, 
  and 
  Cr 
  and 
  a 
  polished 
  plate 
  of 
  iron 
  

   were 
  therefore 
  used, 
  the 
  powders 
  being 
  as 
  nearly 
  as 
  possible 
  

   equally 
  fine, 
  and 
  the 
  relative 
  values 
  of 
  R 
  obtained. 
  From 
  a 
  

   comparision 
  of 
  the 
  two 
  values 
  of 
  R 
  for 
  iron, 
  values 
  of 
  R 
  for 
  

   polished 
  plates 
  of 
  Co 
  and 
  Cr 
  could 
  be 
  deduced, 
  and 
  these 
  were 
  

   found 
  when 
  plotted 
  to 
  lie 
  almost 
  exactly 
  upon 
  the 
  curve 
  in 
  

   fig. 
  3. 
  

  

  From 
  the 
  set 
  of 
  values 
  thus 
  obtained 
  the 
  true 
  relative 
  

   values 
  of 
  R 
  for 
  the 
  complete 
  series 
  of 
  experiments 
  previously 
  

   described 
  were 
  deduced 
  and 
  are 
  ^iven 
  below 
  in 
  Table 
  YI. 
  

  

  