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  ANNUAL 
  REPORT 
  SMITHSONIAN 
  INSTITUTION, 
  1943 
  

  

  RELATIVE 
  EFFICIENCY 
  OF 
  SOLAR 
  RADIATION 
  AS 
  

   A 
  FUNCTION 
  OF 
  AIR 
  MASS 
  CM) 
  

  

  3.0 
  35 
  

  

  Figttre 
  11. 
  — 
  Variation 
  of 
  solar 
  antirachitic 
  effect 
  with 
  air 
  mass. 
  

  

  4 
  

  

  J 
  JAW 
  FEB 
  MAR 
  APR 
  MAY 
  JUNE 
  JULY 
  AUG 
  SEPT 
  OCT 
  NOV 
  OEC 
  

  

  Figtjbe 
  12. 
  — 
  Seasonal 
  variation 
  in 
  solar 
  antirachitic 
  effect 
  for 
  three 
  latitudes. 
  

   (2.0 
  mm. 
  ozone 
  in 
  zenith 
  atmosphere.) 
  

  

  