﻿180 
  

  

  On 
  the 
  Visibility 
  of 
  Radiation, 
  

  

  burner 
  used 
  in 
  this 
  experiment 
  gives 
  an 
  extremely 
  constant 
  

   quality 
  of 
  light 
  * 
  . 
  

  

  In 
  comparison 
  with 
  the 
  other 
  curves 
  shown 
  in 
  fig. 
  2, 
  the 
  

   writer's 
  visibility 
  curve 
  for 
  the 
  thirteen 
  subjects 
  is 
  slightly 
  

  

  \S2 
  .£& 
  .Sti 
  .60 
  .62 
  -64 
  

  

  WAVE 
  LENGTH 
  m 
  tt- 
  Author 
  * 
  s 
  mean 
  of 
  s 
  subjects. 
  

  

  Nuttinas 
  " 
  " 
  M 
  

  

  more 
  contracted. 
  The 
  maximum 
  visibility 
  occurs 
  at 
  wave- 
  

   length 
  *553 
  in 
  agreement 
  with 
  Ives's 
  curve, 
  as 
  against 
  *555 
  

   for 
  Nutting's 
  curve. 
  

  

  * 
  Standardized 
  burners 
  may 
  be 
  obtained 
  from 
  the 
  Research 
  Labora- 
  

   tory, 
  Eastman 
  Kodak 
  Company, 
  Rochester, 
  N.Y. 
  

  

  