﻿APPENDIX 
  7. 
  

  

  REPORT 
  ON 
  THE 
  ASTROPHYSICAL 
  OBSERVATORY. 
  

  

  Sir 
  : 
  The 
  Astrophysic.il 
  Observatory 
  was 
  conducted 
  under 
  the 
  fol- 
  

   lowing 
  passage 
  of 
  the 
  sundry 
  civil 
  act, 
  approved 
  March 
  4, 
  1921 
  : 
  

  

  Astrophysical 
  Observatory 
  : 
  For 
  maintenance 
  of 
  the 
  Astrophysical 
  Observa- 
  

   tory, 
  under 
  the 
  direction 
  of 
  the 
  Smithsonian 
  Institution, 
  including 
  assistants, 
  

   purchase 
  of 
  necessary 
  books 
  and 
  periodicals, 
  apparatus, 
  making 
  necessary 
  

   observations 
  in 
  high 
  altitudes, 
  repairs 
  and 
  alterations 
  of 
  buildings, 
  and 
  mis- 
  

   cellaneous 
  expenses, 
  $15,500. 
  

  

  The 
  observatory 
  occupies 
  a 
  number 
  of 
  frame 
  structures 
  within 
  an 
  

   inclosure 
  of 
  about 
  16,000 
  square 
  feet 
  south 
  of 
  the 
  Smithsonian 
  ad- 
  

   ministration 
  building 
  at 
  Washington, 
  and 
  also 
  a 
  cement 
  observing 
  

   station 
  and 
  frame 
  cottage 
  for 
  observers 
  on 
  a 
  plot 
  of 
  10,000 
  square 
  

   feet 
  leased 
  from 
  the 
  Carnegie 
  Solar 
  Observatory 
  on 
  Mount 
  Wilson, 
  

   Calif. 
  

  

  A 
  new 
  solar 
  observing 
  station 
  on 
  Mount 
  Harqua 
  Hala, 
  Ariz., 
  was 
  

   erected 
  in 
  July, 
  1920, 
  at 
  the 
  expense 
  of 
  funds 
  donated 
  for 
  the 
  pur- 
  

   pose 
  by 
  Mr. 
  John 
  A. 
  Roebling, 
  of 
  Bernardsville, 
  N. 
  J., 
  and 
  this 
  

   station 
  has 
  been 
  occupied 
  as 
  a 
  solar 
  radiation 
  observing 
  station 
  by 
  the 
  

   Astrophysical 
  Observatory 
  since 
  October, 
  1920. 
  

  

  The 
  present 
  value 
  of 
  the 
  buildings 
  and 
  equipment 
  for 
  the 
  Astro- 
  

   physical 
  Observatory, 
  owned 
  by 
  the 
  Government, 
  is 
  estimated 
  at 
  

   $50,000. 
  This 
  estimate 
  contemplates 
  the 
  cost 
  required 
  to 
  replace 
  

   the 
  outfit 
  for 
  the 
  purposes 
  of 
  the 
  investigation. 
  

  

  WORK 
  OF 
  THE 
  YEAR. 
  

  

  At 
  Washington. 
  — 
  The 
  director, 
  with 
  Mr. 
  Fowle 
  and 
  Mrs. 
  Bond, 
  

   was 
  engaged 
  much 
  of 
  the 
  year 
  on 
  the 
  preparation 
  and 
  proof 
  reading 
  

   of 
  Volume 
  IV 
  of 
  the 
  Annals 
  of 
  the 
  Observatory. 
  This 
  quarto 
  

   volume 
  of 
  390 
  pages, 
  including 
  60 
  illustrations 
  and 
  118 
  pages 
  of 
  

   numerical 
  tables, 
  covers 
  the 
  work 
  of 
  the 
  years 
  1912 
  to 
  1920, 
  and 
  

   was 
  published 
  in 
  June, 
  1922. 
  New 
  apparatus 
  and 
  methods 
  of 
  ob- 
  

   serving 
  are 
  described 
  and 
  illustrated, 
  and 
  a 
  large 
  mass 
  of 
  solar 
  

   observations 
  is 
  presented 
  and 
  discussed. 
  Evidence 
  is 
  given 
  of 
  many 
  

   kinds 
  which 
  indicates 
  the 
  solar 
  variability. 
  Reference 
  is 
  made 
  to 
  

   applications 
  of 
  the 
  results 
  which 
  have 
  been 
  made 
  by 
  several 
  me- 
  

   teorologists. 
  

  

  In 
  preparation 
  for 
  work 
  proposed 
  for 
  the 
  expedition 
  to 
  Mount 
  

   Wilson 
  in 
  the 
  summer 
  of 
  1922, 
  Mr. 
  Aldrich, 
  in 
  consultation 
  with 
  

   104 
  

  

  