﻿F. 
  W. 
  Very 
  — 
  Solar 
  Radiation. 
  

  

  619 
  

  

  mountain, 
  the 
  more 
  elevated 
  and 
  drier 
  station 
  gives 
  the 
  larger 
  

   radiation. 
  The 
  effect 
  here 
  is 
  complicated 
  by 
  a 
  dust-factor, 
  

   but 
  it 
  can 
  not 
  be 
  doubted 
  that 
  water 
  vapor 
  has 
  some 
  part 
  to 
  

   play 
  in 
  this 
  variation 
  of 
  atmospheric 
  quality. 
  

  

  Fig. 
  1. 
  

  

  

  

  

  

  

  

  

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  10 
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  Fig. 
  1. 
  Abscissas 
  = 
  pressure 
  of 
  aqueous 
  vapor 
  in 
  the 
  free 
  air 
  at 
  the 
  level 
  

   of 
  the 
  place 
  of 
  observation. 
  Ordinates 
  = 
  factors 
  for 
  reducing 
  observed 
  solar 
  

   radiation 
  to 
  corresponding 
  values 
  at 
  the 
  outer 
  limit 
  of 
  the 
  atmosphere. 
  Full 
  

   lines 
  are 
  for 
  sea-level. 
  Dotted 
  lines 
  are 
  for 
  level 
  of 
  Mt. 
  Wilson 
  = 
  1780 
  

   meters, 
  e 
  = 
  (B/B 
  ) 
  x 
  Sec. 
  £ 
  

  

  The 
  actinometric 
  method 
  of 
  solar 
  investigation 
  is 
  not 
  capable 
  

   of 
  yielding 
  exact 
  values 
  of 
  the 
  solar 
  constant 
  except 
  under 
  rare 
  

  

  