﻿98 
  AITNUAL 
  REPORT 
  SMITHSONIAN 
  INSTITUTION, 
  19 
  2 
  9 
  

  

  method 
  at 
  all 
  stations 
  as 
  a 
  check 
  on 
  the 
  short 
  method 
  in 
  daily 
  use, 
  

   Fowle 
  was 
  able 
  to 
  determine 
  the 
  atmospheric 
  ozone 
  at 
  Calama, 
  Mon- 
  

   tezuma, 
  Harqua 
  Hala, 
  and 
  Table 
  Mountain 
  on 
  very 
  many 
  occasions 
  

   since 
  the 
  year 
  1920. 
  

  

  It 
  proved, 
  harmoniousl}^ 
  to 
  what 
  Dobson 
  had 
  found, 
  that 
  the 
  ozone 
  

   above 
  Mount 
  Montezuma 
  is 
  meager 
  and 
  nearly 
  invariable 
  in 
  quan- 
  

   tity, 
  but 
  that 
  above 
  Harqua 
  Hala 
  and 
  Table 
  Mountain 
  it 
  is 
  much 
  more 
  

   pl-entiful 
  and 
  very 
  variable. 
  Having 
  compared 
  the 
  variations 
  of 
  

   monthly 
  mean 
  ozone 
  values 
  with 
  the 
  Table 
  Mountain 
  observations 
  of 
  

   corresponding 
  variations 
  of 
  solar 
  constant 
  values, 
  Mr. 
  Fowle 
  found 
  

   a 
  strong 
  correlation 
  between 
  them. 
  As 
  the 
  yearly 
  march 
  of 
  the 
  

   m9nthly 
  mean 
  ozone 
  values 
  at 
  these 
  northern 
  stations 
  appears 
  to 
  be 
  

   a 
  terrestrial 
  phenomenon, 
  a 
  fact 
  entirely 
  harmonious 
  to 
  those 
  well 
  

   established 
  by 
  Dobson, 
  it 
  seemed 
  entirely 
  legitimate 
  to 
  introduce 
  a 
  

   solar 
  constant 
  correction, 
  statistically 
  determined, 
  to 
  allow 
  for 
  ozone 
  

   in 
  much 
  the 
  same 
  way 
  as 
  for 
  water 
  vapor, 
  for 
  the 
  Harqua 
  Hala 
  

   values. 
  

  

  (d) 
  Concordant 
  results 
  of 
  Table 
  Mountain 
  and 
  Montezun^a. 
  — 
  This 
  

   having 
  been 
  done, 
  and 
  the 
  water-vapor 
  and 
  haziness 
  corrections 
  hav- 
  

   ing 
  been 
  applied, 
  it 
  was 
  found 
  that 
  the 
  absolutely 
  independent 
  final 
  

   values 
  of 
  the 
  solar 
  constant 
  determined 
  at 
  two 
  stations 
  4,000 
  miles 
  

   apart 
  (viz. 
  Table 
  Mountain, 
  7,500 
  feet 
  high, 
  in 
  California, 
  and 
  Monte- 
  

   zuma, 
  9,000 
  feet 
  high, 
  in 
  Chile) 
  march 
  with 
  gratifying 
  accord. 
  For 
  

   the 
  ratios 
  of 
  the 
  values 
  determined 
  at 
  the 
  two 
  stations 
  show 
  no 
  ap- 
  

   preciable 
  indication 
  of 
  a 
  yearly 
  range, 
  although 
  winter 
  at 
  the 
  one 
  

   station 
  corresponds 
  with 
  summer 
  at 
  the 
  other. 
  Furthermore, 
  the 
  

   total 
  range 
  of 
  straggle 
  of 
  nine-tenths 
  of 
  the 
  daily 
  ratios 
  of 
  these 
  

   independent 
  values 
  does 
  not 
  exceed 
  1.1 
  per 
  cent. 
  This 
  involves 
  the 
  

   conclusion 
  that 
  the 
  total 
  range 
  of 
  accidental 
  error 
  at 
  a 
  single 
  station 
  

   seldom 
  exceeds 
  0.8 
  per 
  cent, 
  and 
  therefore 
  the 
  probable 
  value 
  of 
  the 
  

   accidental 
  determination 
  of 
  a 
  single 
  day 
  at 
  one 
  station 
  is 
  less 
  than 
  

   0.3 
  per 
  cent. 
  This 
  being 
  so, 
  we 
  are 
  prepared 
  to 
  expect 
  that 
  both 
  

   stations, 
  though 
  wholly 
  independent, 
  must 
  concur 
  within 
  nai-row 
  

   limits 
  in 
  their 
  determination 
  of 
  the 
  sun's 
  variation. 
  

  

  {e) 
  Preparation 
  of 
  Volume 
  V 
  of 
  the 
  Annals. 
  — 
  With 
  this 
  gratify- 
  

   ing 
  conclusion 
  reached 
  in 
  the 
  final 
  discussion 
  of 
  the 
  results 
  of 
  two 
  

   independent 
  solar 
  observing 
  stations 
  remote 
  from 
  each 
  other, 
  a 
  point 
  

   seems 
  to 
  be 
  reached 
  where 
  it 
  is 
  proper 
  to 
  publish 
  Volume 
  V 
  of 
  the 
  

   Annals 
  of 
  the 
  Astrophysical 
  Observatory, 
  to 
  contain 
  the 
  numerous 
  

   observations 
  obtained 
  since 
  the 
  year 
  1920. 
  Doctor 
  Abbot 
  has 
  been 
  

   engaged 
  on 
  the 
  preparation 
  of 
  this 
  text, 
  and 
  it 
  is 
  hoped 
  that 
  the 
  

   volume 
  will 
  be 
  ready 
  to 
  publish 
  in 
  the 
  fiscal 
  year 
  ending 
  June, 
  1931, 
  

   thus 
  including 
  a 
  full 
  decade 
  of 
  observations. 
  

  

  (/) 
  Other 
  work 
  at 
  Washington. 
  — 
  As 
  usual, 
  many 
  instruments 
  have 
  

   i|>een 
  constructed 
  at 
  Washington 
  for 
  research 
  purposes. 
  These 
  in- 
  

  

  