﻿SOLAR 
  RADIATION 
  AS 
  A 
  POWER 
  SOURCE 
  — 
  ABBOT 
  

  

  105 
  

  

  fener. 
  Simple 
  stout 
  wooden 
  posts, 
  set 
  in 
  the 
  ground, 
  are 
  adapted 
  

   to 
  carry 
  rollers 
  on 
  which 
  the 
  trunnions 
  rest 
  with 
  their 
  axis 
  parallel 
  

   to 
  that 
  of 
  the 
  earth. 
  The 
  elongated 
  Pyrex 
  thermos 
  bottle 
  enclosing 
  

   the 
  boiler 
  tube 
  rests 
  axial 
  to 
  the 
  hollow 
  trunnions 
  and 
  is 
  closed 
  at 
  

   the 
  lower 
  end. 
  

  

  To 
  drive 
  the 
  mirror 
  most 
  conveniently, 
  a 
  worm-and-wheel 
  mecha- 
  

   nism 
  is 
  attached 
  to 
  one 
  end 
  of 
  the 
  mirror 
  and 
  its 
  support. 
  The 
  worm 
  

   is 
  driven 
  at 
  the 
  correct 
  speed 
  by 
  a 
  tiny 
  60-cycle 
  electric 
  motor. 
  Where 
  

   alternating 
  electric 
  current 
  is 
  difficultly 
  available, 
  a 
  weight 
  drive 
  may 
  

   be 
  substituted, 
  regulated 
  by 
  an 
  escapement 
  controlled 
  by 
  an 
  ordinary 
  

  

  Figube 
  3. 
  — 
  Diagram 
  of 
  variable-delivery 
  injector, 
  with 
  delivery 
  governed 
  by 
  

   pressure 
  of 
  steam 
  as 
  first 
  used 
  with 
  Dr. 
  Abbot's 
  flash 
  boiler. 
  

  

  alarm 
  clock. 
  I 
  have 
  used 
  such 
  a 
  contrivance 
  successfully 
  for 
  a 
  large 
  

   mirror 
  on 
  Mount 
  Wilson. 
  

  

  For 
  solar 
  power, 
  I 
  prefer 
  the 
  "flash 
  boiler" 
  principle 
  because 
  of 
  its 
  

   economy 
  of 
  fair 
  skies. 
  2 
  Even 
  in 
  the 
  desert 
  regions, 
  cumulus 
  clouds 
  

   occasionally 
  hide 
  the 
  sun. 
  If 
  the 
  boiler 
  had 
  a 
  considerable 
  ca- 
  

   pacity 
  for 
  heat, 
  a 
  series 
  of 
  such 
  clouds 
  might 
  prevent 
  getting 
  full 
  

   steam 
  pressure 
  at 
  all 
  on 
  a 
  day 
  when 
  the 
  sun 
  shone 
  clearly 
  one-half 
  

   (lie 
  time. 
  But 
  when 
  the 
  flash 
  boiler 
  is 
  properly 
  designed, 
  full 
  steam 
  

   pressure 
  comes 
  on 
  within 
  5 
  minutes 
  after 
  the 
  sun 
  emerges 
  from 
  such 
  

   a 
  cloud. 
  This 
  design 
  involves 
  the 
  automatic 
  regulation 
  of 
  the 
  water 
  

   supply, 
  to 
  be 
  completely 
  turned 
  to 
  steam 
  as 
  fast 
  as 
  supplied 
  while 
  

  

  2 
  I 
  have 
  changed 
  my 
  view 
  recently, 
  as 
  indicated 
  in 
  the 
  concluding 
  paragraph 
  of 
  this 
  paper. 
  

  

  