﻿Transformations 
  of 
  X-Rays. 
  

  

  121 
  

  

  \o 
  

  

  The 
  values 
  o£ 
  — 
  for 
  Co 
  and 
  Cr 
  deduced 
  from 
  this 
  graph 
  

  

  are 
  Co 
  (61-3), 
  Cr 
  (83-7). 
  

  

  Moreover, 
  a 
  regular 
  relationship 
  is 
  found 
  to 
  exist 
  between 
  

   the 
  ratios 
  of 
  \i 
  for 
  the 
  radiations 
  from 
  consecutive 
  members 
  

   of 
  the 
  group 
  Cr-Se 
  for 
  each 
  of 
  the 
  absorbers 
  Zn, 
  Cu, 
  Ni, 
  

   and 
  Fe. 
  Taldng 
  the 
  values 
  of 
  the 
  absorption 
  coefficients 
  for 
  

   any 
  three 
  of 
  these 
  absorbers 
  for 
  the 
  radiations 
  from 
  the 
  gToup 
  

   Cr-Se, 
  values 
  for 
  the 
  coefficients 
  for 
  the 
  fourth 
  absorber 
  

   could 
  be 
  deduced, 
  starting 
  with 
  a 
  value 
  of 
  X2 
  ^s 
  a 
  basis 
  and 
  

   using 
  these 
  observed 
  relationships. 
  In 
  no 
  case 
  was 
  the 
  

   discrepancy 
  between 
  the 
  experimental 
  and 
  deduced 
  values 
  

   greater 
  than 
  2 
  per 
  cent. 
  

  

  In 
  a 
  similar 
  manner 
  the 
  remaining 
  values 
  of 
  the 
  absorption 
  

   coefficients 
  for 
  Co 
  and 
  Cr 
  were 
  deduced, 
  taking 
  the 
  values 
  of 
  

   X2 
  obtained 
  above 
  as 
  a 
  basis 
  for 
  calculation 
  in 
  each 
  case. 
  

  

  Table 
  V. 
  

  

  Values 
  of 
  X 
  used 
  in 
  calculation 
  of 
  Jc. 
  

  

  Values 
  of 
  \' 
  used 
  in 
  calculation 
  

   of 
  the 
  ratio 
  ~ 
  

  

  A 
  

  

  Absorbers. 
  

  

  Radiators. 
  

  

  Al. 
  

  

  Chromium., 
  

  

  Iron 
  

  

  Cobalt 
  

  

  Nickel 
  

  

  Copper 
  

  

  Zinc 
  

  

  Arsenic 
  

  

  Selenium 
  .. 
  

   Silver 
  

  

  367 
  

  

  239 
  

  

  193-2 
  

  

  159-5 
  

  

  128-9 
  

  

  106-3 
  

  

  60-7 
  

  

  510 
  

  

  6-75 
  

  

  Cr. 
  

  

  544 
  

   2500 
  

   2076 
  

  

  Fe. 
  

  

  614 
  

   521 
  

  

  1730 
  2440 
  

   1478 
  2080 
  

  

  227 
  

   755 
  

   652 
  

  

  1715 
  

  

  1040 
  

  

  903 
  

  

  Co. 
  

  

  545 
  

   584 
  

   2560 
  

   2172 
  

   1333 
  

   1159 
  

  

  m. 
  

  

  Cu. 
  Zn. 
  

  

  482 
  

  

  537 
  

  

  2275 
  

  

  1422 
  

  

  1211 
  

  

  474 
  

  

  497 
  

   1575 
  

   1340 
  

  

  214 
  

  

  361 
  

   1464 
  

   1258 
  

   195-1 
  

  

  Cr. 
  

  

  2150 
  

   1785 
  

   1490 
  

   1279 
  

   1072 
  

   666 
  

   577 
  

  

  Pe. 
  

  

  102 
  

  

  2090 
  

  

  1798 
  

  

  1485 
  

  

  915 
  

  

  800 
  

  

  Co. 
  

  

  134-0 
  

   2194 
  

  

  1875 
  

   1161 
  

   1014 
  

  

  Ni. 
  

  

  Cu. 
  Zn. 
  

  

  150 
  

  

  1936 
  i 
  1201 
  

  

  1232 
  1356 
  1260 
  

  

  1055, 
  1157 
  1 
  1080 
  

  

  189-2 
  1700 
  

  

  It 
  will 
  be 
  seen 
  later 
  that 
  it 
  is 
  desirable 
  to 
  know 
  what 
  

   fraction 
  of 
  the 
  absorption 
  of 
  the 
  exiting 
  radiation 
  by 
  the 
  

   material 
  of 
  the 
  radiator 
  is 
  directly 
  concerned 
  in 
  the 
  trans- 
  

   formations 
  of. 
  energy 
  which 
  are 
  taking 
  place 
  during 
  the 
  

  

  