﻿32 
  JOURNAI, 
  Olf 
  THS 
  WASHINGTON 
  ACADKMY 
  OS 
  SCIENCES 
  VOL. 
  12, 
  NO. 
  2 
  

  

  true 
  zero 
  line 
  

  

  A4>= 
  +0".0590 
  + 
  0".0081/, 
  

  

  where 
  t 
  is 
  the 
  time 
  in 
  years 
  reckoned 
  from 
  the 
  epoch, 
  Oct. 
  1, 
  1908. 
  

   This 
  line 
  is 
  the 
  one 
  shown 
  in 
  figure 
  2. 
  The 
  slope 
  +0".0081, 
  with 
  a 
  

   probable 
  error 
  =i=0".0010 
  per 
  year, 
  is 
  somewhat 
  smaller 
  than 
  the 
  

   +0".0094 
  found 
  by 
  Professor 
  Lawson 
  but 
  still 
  quite 
  large 
  enough 
  to 
  be 
  

   of 
  interest, 
  and 
  if 
  taken 
  at 
  its 
  face 
  value, 
  it 
  is 
  large 
  enough 
  to 
  render 
  

   probable 
  Professor 
  Lawson's 
  thesis 
  of 
  a 
  northward 
  movement 
  of 
  the 
  

   superficial 
  crust 
  at 
  Ukiah. 
  

  

  Before 
  reaching 
  definite 
  conclusions 
  in 
  the 
  matter 
  it 
  is 
  desirable 
  to 
  

   see 
  what 
  is 
  happening 
  at 
  the 
  other 
  stations 
  of 
  the 
  International 
  Lati- 
  

   tude 
  Service. 
  These 
  stations 
  all 
  use 
  the 
  same 
  program 
  of 
  stars 
  and 
  

   any 
  errors 
  in 
  the 
  declinations 
  used 
  affect 
  all 
  stations 
  alike 
  except 
  

   insofar 
  as 
  bad 
  weather 
  may 
  cause 
  the 
  stars 
  observed 
  to 
  be 
  different 
  

   at 
  the 
  different 
  stations. 
  It 
  is 
  to 
  be 
  supposed, 
  however, 
  that 
  the 
  

   difference 
  in 
  the 
  effect 
  at 
  different 
  stations 
  of 
  errors 
  in 
  declination 
  

   due 
  to 
  the 
  different 
  stars 
  actually 
  used 
  may 
  be 
  considered 
  as 
  causing 
  

   accidental 
  errors 
  in 
  the 
  result 
  rather 
  than 
  systematic 
  ones. 
  The 
  

   observatories 
  of 
  the 
  Latitude 
  Service 
  are 
  all 
  close 
  to 
  the 
  paralleP 
  of 
  

   39° 
  8'; 
  they 
  are: 
  Mizusawa 
  in 
  Japan, 
  still 
  running; 
  Tschardjui 
  (or 
  as 
  

   more 
  simply 
  spelled 
  Charjui) 
  in 
  Russian 
  Turkestan, 
  closed 
  at 
  the 
  end 
  

   of 
  1914 
  ; 
  Carloforte 
  on 
  a 
  little 
  island 
  off 
  the 
  larger 
  island 
  of 
  Sardinia, 
  still 
  

   running; 
  Gaithersburg, 
  Maryland, 
  closed 
  at 
  the 
  end 
  of 
  1914; 
  Cincin- 
  

   nati, 
  Ohio, 
  work 
  for 
  the 
  International 
  Latitude 
  Service 
  discontinued 
  

   at 
  the 
  end 
  of 
  1915 
  ; 
  Ukiah, 
  California, 
  still 
  running. 
  

  

  It 
  was 
  the 
  original 
  intention 
  to 
  have 
  all 
  the 
  observatories 
  constructed 
  

   on 
  exactly 
  the 
  same 
  plan 
  and 
  equipped 
  with 
  zenith 
  telescopes 
  of 
  the 
  

   same 
  pattern. 
  It 
  proved 
  impracticable, 
  however, 
  to 
  live 
  up 
  to 
  this 
  

   plan 
  and 
  the 
  instruments 
  at 
  Tschardjui 
  and 
  Cincinnati 
  are 
  smaller 
  

   than 
  those 
  at 
  the 
  other 
  stations. 
  This 
  fact 
  and 
  perhaps 
  also 
  the 
  

   vagaries 
  of 
  their 
  climates, 
  which 
  are 
  more 
  markedly 
  continental 
  in 
  

   character 
  at 
  these 
  stations 
  than 
  at 
  the 
  other 
  four, 
  have 
  caused 
  the 
  

   probable 
  errors 
  of 
  the 
  results 
  from 
  Cincinnati 
  and 
  Tschardjui 
  to 
  be 
  

   relatively 
  large. 
  Furthermore, 
  the 
  Tschardjui 
  results 
  are 
  complicated 
  

   by 
  the 
  removal 
  of 
  the 
  observatory 
  in 
  1909 
  to 
  a 
  new 
  location, 
  a 
  removal 
  

   forced 
  by 
  the 
  wanderings 
  of 
  the 
  Amu 
  Darya 
  River, 
  the 
  ancient 
  Oxus. 
  

   The 
  old 
  site 
  was 
  threatened 
  and 
  finally 
  inundated 
  and 
  the 
  latitude 
  

   connection 
  between 
  the 
  old 
  and 
  new 
  sites 
  is 
  rather 
  weak. 
  All 
  these 
  

  

  8 
  For 
  longitudes 
  see 
  table 
  2 
  on 
  p. 
  36 
  

  

  