﻿JAN. 
  19, 
  1922 
  LAMBERT: 
  LATITUDE) 
  OF 
  UKIAH 
  33 
  

  

  circumstances 
  combined 
  have 
  made 
  the 
  results 
  at 
  Tschardjui 
  relatively 
  

   so 
  inaccurate 
  that 
  they 
  have 
  very 
  little 
  weight 
  in 
  the 
  final 
  results 
  of 
  this 
  

   discussion. 
  To 
  a 
  less 
  degree 
  the 
  same 
  holds 
  good 
  of 
  Cincinnati. 
  

   The 
  observations 
  at 
  the 
  four 
  remaining 
  stations 
  are 
  about 
  equal 
  in 
  

   quality. 
  

  

  Sir 
  Frank 
  Dyson 
  did 
  not 
  give 
  curves 
  like 
  that 
  at 
  Ukiah 
  for 
  all 
  the 
  

   six 
  stations 
  and 
  there 
  appeared 
  to 
  be 
  some 
  uncertainty 
  about 
  the 
  

   declinations 
  used 
  in 
  the 
  latter 
  part 
  of 
  the 
  period 
  that 
  he 
  treats, 
  a 
  matter 
  

   important 
  for 
  the 
  present 
  purpose 
  but 
  not 
  very 
  important 
  for 
  his 
  

   purpose, 
  so 
  it 
  was 
  decided 
  to 
  start 
  afresh 
  and 
  to 
  derive 
  curves 
  for 
  all 
  

   six 
  stations, 
  utilizing 
  all 
  the 
  observed 
  latitudes 
  available; 
  these 
  ex- 
  

   tended 
  from 
  1900 
  through 
  1917, 
  a 
  year 
  beyond 
  the 
  time 
  covered 
  by 
  

   Dyson. 
  The 
  new 
  curves 
  were 
  based 
  on 
  the 
  definitive 
  latitudes 
  of 
  the 
  

   International 
  Latitude 
  Service'^ 
  and 
  the 
  provisional 
  results 
  published 
  

   from 
  time 
  to 
  time 
  in 
  the 
  Astronomische 
  Nachrichten.^ 
  These 
  results 
  

   are 
  all 
  on 
  a 
  common 
  declination 
  system, 
  that 
  of 
  Vol. 
  3 
  of 
  the 
  Resultate, 
  

   not 
  the 
  ideal 
  system 
  perhaps, 
  but 
  one 
  consistent 
  with 
  itself. 
  On 
  ac- 
  

   count 
  of 
  the 
  precession 
  some 
  of 
  the 
  stars 
  necessarily 
  drop 
  out 
  of 
  a 
  star 
  

   program 
  as 
  time 
  goes 
  on. 
  In 
  the 
  provisional 
  results 
  these 
  discontinued 
  

   stars 
  have 
  not 
  been 
  replaced 
  by 
  others. 
  The 
  provisional 
  results 
  

   therefore 
  depend 
  on 
  a 
  smaller 
  number 
  of 
  stars, 
  thus 
  reducing 
  the 
  weight 
  

   of 
  the 
  results 
  to 
  about 
  Ve 
  oi 
  that 
  of 
  the 
  definitive 
  ones. 
  

  

  The 
  latitudes 
  of 
  the 
  several 
  stations 
  were 
  plotted, 
  curves 
  were 
  

   drawn 
  to 
  smooth 
  out 
  the 
  worst 
  roughnesses 
  in 
  the 
  plotted 
  values, 
  and 
  

   these 
  curves 
  were 
  analyzed 
  harmonically 
  to 
  obtain 
  the 
  amplitudes 
  

   and 
  epochs 
  of 
  both 
  the 
  annual 
  and 
  the 
  14-month 
  components. 
  Each 
  

   station 
  was 
  treated 
  by 
  itself. 
  Some 
  refinements 
  not 
  found 
  in 
  all 
  

   harmonic 
  analyses 
  were 
  introduced 
  and 
  seemed 
  to 
  justify 
  their 
  intro- 
  

   duction 
  by 
  the 
  better 
  agreement 
  thus 
  obtained 
  between 
  the 
  various 
  

   determinations 
  of 
  the 
  same 
  quantity. 
  The 
  details 
  will 
  be 
  given 
  in 
  my 
  

   longer 
  publication 
  on 
  the 
  subject. 
  

  

  By 
  taking 
  out 
  the 
  annual 
  term 
  from 
  the 
  curve 
  of 
  observed 
  latitudes 
  

   it 
  would 
  have 
  been 
  possible 
  to 
  draw 
  curves 
  like 
  Dyson's, 
  containing, 
  

   presumably, 
  only 
  the 
  effects 
  of 
  the 
  14-month 
  term 
  and 
  of 
  a 
  possible 
  

   shift 
  in 
  the 
  true 
  zero 
  line. 
  At 
  least, 
  if 
  other 
  effects 
  were 
  present, 
  

   they 
  would 
  be 
  treated 
  as 
  accidental 
  errors. 
  By 
  reading 
  these 
  new 
  

  

  " 
  Zentralbureau 
  der 
  Internationalen 
  Erdmessung 
  (Berlin). 
  Resultate 
  des 
  Internationalen 
  

   Breitendienstes. 
  3: 
  1909. 
  5: 
  1916. 
  

  

  »Astr. 
  Nachr. 
  198: 
  No. 
  4749. 
  1914. 
  201: 
  No. 
  4802. 
  1915. 
  203: 
  No. 
  4855. 
  1916. 
  

   206: 
  No. 
  4908. 
  1917. 
  208: 
  No. 
  4969. 
  1918. 
  

  

  