﻿132 
  ANNUAL 
  REPORT 
  SMITHSONIAN 
  INSTITUTION, 
  1943 
  

  

  2700 
  2860 
  2900 
  

  

  WAVELENGTH 
  IN 
  ANGSTROMS 
  

  

  35o6~ 
  

  

  Figuke 
  25. 
  — 
  Variation 
  of 
  bactericidal 
  effect 
  with 
  wave 
  length. 
  

  

  vw 
  

  

  3000 
  3100 
  

  

  WAVELENGTH 
  IN 
  ANGSTROMS 
  

  

  3200 
  

  

  Figure 
  26. 
  — 
  Product 
  curves 
  of 
  solar 
  spectral 
  energy 
  by 
  bactericidal 
  efficiency. 
  

   (3.0 
  mm. 
  ozone 
  in 
  zenith 
  atmosphere.) 
  

  

  