﻿108 
  ANNUAL, 
  REPORT 
  SMITHSONIAN 
  INSTITUTION, 
  1922. 
  

  

  lar 
  weekly 
  long-range 
  forecasts 
  which 
  it 
  bases 
  on 
  solar 
  radiation 
  

   results. 
  In 
  order 
  to 
  aid 
  these 
  enterprises, 
  the 
  director 
  has 
  designed 
  

   a 
  full 
  set 
  of 
  solar-constant 
  apparatus, 
  and 
  it 
  is 
  expected 
  that 
  within 
  

   the 
  next 
  fiscal 
  year 
  two 
  sets 
  will 
  be 
  prepared 
  by 
  contract 
  for 
  the 
  

   Australian 
  and 
  Argentine 
  stations. 
  

  

  PERSONNEL. 
  

  

  Mr. 
  A. 
  F. 
  Moore, 
  field 
  director 
  at 
  Mount 
  Harqua 
  Hala, 
  was 
  added 
  

   to 
  the 
  staff 
  of 
  the 
  Astrophysical 
  Observatory 
  on 
  July 
  1, 
  1921. 
  

  

  SUMMARY. 
  

  

  The 
  outstanding 
  event 
  of 
  the 
  fiscal 
  year 
  was 
  the 
  publication 
  in 
  

   June, 
  1922, 
  of 
  Volume 
  IV 
  of 
  the 
  Annals 
  of 
  the 
  Astrophysical 
  Observ- 
  

   atory, 
  covering 
  results 
  from 
  1912 
  to 
  1920. 
  New 
  apparatus 
  and 
  

   methods 
  are 
  described, 
  a 
  critical 
  survey 
  of 
  the 
  work 
  is 
  given, 
  and 
  

   long 
  tabular 
  summaries 
  of 
  all 
  solar 
  observations 
  made 
  are 
  included. 
  

   From 
  these 
  results 
  it 
  is 
  indicated 
  in 
  numerous 
  ways 
  that 
  the 
  sun's 
  

   output 
  of 
  radiation 
  varies, 
  that 
  the 
  march 
  of 
  its 
  variations 
  depends 
  

   on 
  the 
  sun's 
  rotation, 
  and 
  that 
  it 
  produces 
  effects 
  of 
  several 
  kinds 
  

   on 
  terrestrial 
  physics 
  and 
  meteorology. 
  Much 
  progress 
  has 
  been 
  

   made 
  at 
  the 
  new 
  station 
  on 
  Mount 
  Harqua 
  Hala. 
  Solar-constant 
  

   observations 
  were 
  made 
  there 
  on 
  over 
  70 
  per 
  cent 
  of 
  the 
  days, 
  but 
  

   are 
  withheld 
  from 
  publication 
  until 
  completely 
  discussed 
  for 
  evi- 
  

   dences 
  as 
  to 
  systematic 
  errors. 
  Expeditions 
  were 
  made 
  to 
  Chile 
  and 
  

   io 
  Mount 
  Wilson. 
  

  

  Respectfully 
  submitted. 
  

  

  C. 
  G. 
  Abbot, 
  

  

  • 
  Director. 
  

  

  Dr. 
  Charles 
  D. 
  Walcott, 
  

  

  Secretary, 
  /Smithsonian 
  Institution. 
  

  

  