﻿106 
  ANNUAL 
  REPORT 
  SMITHSONIAN 
  INSTITUTION, 
  1922. 
  

  

  Fourth, 
  to 
  try 
  further 
  experiments 
  with 
  the 
  collection 
  and 
  storage 
  

   of 
  solar 
  heat 
  for 
  cooking 
  purposes. 
  

  

  The 
  station 
  on 
  Mount 
  Harqua 
  Hala 
  was 
  visited 
  by 
  the 
  director 
  

   and 
  found 
  in 
  a 
  highly 
  improved 
  condition 
  owing 
  to 
  the 
  zeal 
  of 
  Mr. 
  

   Moore, 
  in 
  charge 
  there. 
  The 
  laboratory 
  has 
  been 
  sheathed 
  outside 
  

   with 
  metal 
  to 
  protect 
  the 
  adobe 
  walls 
  from 
  rain, 
  and 
  painted 
  and 
  

   embellished 
  within, 
  lightning 
  rods 
  have 
  been 
  installed, 
  a 
  small 
  shop 
  

   built, 
  wireless 
  telephonic 
  apparatus 
  erected, 
  a 
  garage 
  built 
  at 
  the 
  

   foot 
  of 
  the 
  mountain 
  trail, 
  and 
  regular 
  weekly 
  mail 
  and 
  supply 
  

   trips 
  arranged. 
  Solar-constant 
  observations 
  have 
  been 
  made 
  on 
  

   upward 
  of 
  70 
  per 
  cent 
  of 
  the 
  days 
  of 
  the 
  year, 
  and 
  much 
  computing 
  

   and 
  testing 
  attended 
  to. 
  Comparisons 
  made 
  during 
  and 
  after 
  the 
  

   director's 
  visit 
  show 
  no 
  change 
  in 
  the 
  scale 
  of 
  pyrheliometry, 
  so 
  

   that 
  as 
  far 
  as 
  this 
  is 
  concerned 
  the 
  results 
  at 
  Harqua 
  Hala 
  are 
  com- 
  

   parable 
  with 
  those 
  at 
  Montezuma. 
  But 
  from 
  lack 
  of 
  sensitiveness 
  

   of 
  the 
  galvanometer 
  the 
  energy 
  curves 
  show 
  less 
  detail 
  at 
  Harqua 
  

   Hala, 
  and 
  this 
  it 
  was 
  decided 
  must 
  be 
  corrected 
  as 
  early 
  as 
  possible 
  

   to 
  put 
  the 
  two 
  stations 
  on 
  parallel 
  footings. 
  

  

  In 
  conversation 
  with 
  Mr. 
  Moore, 
  the 
  director 
  devised 
  a 
  new 
  im- 
  

   provement 
  of 
  the 
  " 
  short 
  method 
  " 
  which, 
  it 
  was 
  agreed, 
  would 
  pro- 
  

   mote 
  accuracy 
  while 
  greatly 
  abridging 
  computation. 
  This 
  will 
  be 
  

   introduced 
  at 
  both 
  stations 
  as 
  soon 
  as 
  the 
  new 
  determination 
  of 
  the 
  

   form 
  of 
  the 
  solar 
  energy 
  curve 
  outside 
  the 
  atmosphere 
  is 
  worked 
  out. 
  

  

  At 
  Mount 
  Wilson, 
  the 
  time 
  before 
  the 
  end 
  of 
  the 
  fiscal 
  year, 
  June 
  

   30, 
  only 
  sufficed 
  for 
  a 
  partial 
  installation 
  of 
  new 
  "solar 
  constant" 
  

   apparatus 
  replacing 
  that 
  which 
  in 
  1920 
  was 
  removed 
  to 
  Harqua 
  

   Hala. 
  But 
  it 
  may 
  be 
  said 
  by 
  anticipation 
  that 
  later 
  results 
  were 
  

   secured 
  on 
  the 
  distribution 
  of 
  energy 
  in 
  the 
  spectra 
  of 
  11 
  of 
  the 
  

   brighter 
  stars 
  by 
  bolometric 
  work 
  in 
  comiection 
  with 
  the 
  100-inch 
  

   telescope, 
  and 
  also 
  that 
  the 
  solar 
  energy 
  curve 
  was 
  traced 
  bolo- 
  

   metrically 
  with 
  both 
  glass 
  and 
  rock-salt 
  prisms. 
  With 
  the 
  latter, 
  

   experiments 
  were 
  made 
  at 
  wave 
  lengths 
  from 
  far 
  down 
  in 
  the 
  ultra- 
  

   violet 
  to 
  an 
  infra-red 
  wave 
  length 
  of 
  14 
  microns, 
  with 
  allowance 
  for 
  

   stray 
  light 
  and 
  for 
  atmospheric 
  and 
  instrumental 
  transmission. 
  

  

  Unfortunately 
  the 
  cover 
  of 
  the 
  oil 
  reservoir 
  of 
  the 
  solar 
  cooking 
  

   apparatus 
  had 
  been 
  blown 
  off 
  in 
  a 
  very 
  high 
  wind, 
  and 
  snow 
  hav- 
  

   ing 
  gotten 
  in, 
  much 
  water 
  had 
  leaked 
  into 
  the 
  oil 
  reservoir. 
  After 
  

   a 
  long 
  time 
  of 
  fruitlessly 
  attempting 
  to 
  boil 
  out 
  this 
  water, 
  the 
  oil 
  

   and 
  water 
  were 
  at 
  length 
  removed, 
  but 
  not 
  in 
  time 
  to 
  undertake 
  the 
  

   proposed 
  new 
  experiments 
  before 
  the 
  return 
  of 
  the 
  expedition 
  to 
  

   Washington 
  in 
  September. 
  

  

  OPINIONS 
  OF 
  THE 
  SOLAR 
  RADIATION 
  WORK. 
  

  

  As 
  the 
  Institution 
  is 
  making 
  great 
  efforts 
  to 
  continue 
  and 
  to 
  im- 
  

   prove 
  its 
  solar-radiation 
  measurements, 
  the 
  director 
  felt 
  concerned 
  

   to 
  invite 
  the 
  opinions 
  of 
  competent 
  critics, 
  in 
  order 
  to 
  know 
  if 
  these 
  

  

  