﻿82 
  

  

  T. 
  C. 
  Mendenhall 
  — 
  Relation 
  of 
  

  

  one 
  or 
  two 
  stations 
  in 
  the 
  interior 
  at 
  which 
  the 
  Coast 
  Survey 
  

   had 
  not 
  before 
  observed. 
  These 
  fundamental 
  stations, 
  in 
  con- 
  

   nection 
  with 
  those 
  already 
  occupied 
  by 
  the 
  American 
  observers, 
  

   made 
  it 
  possible 
  to 
  form 
  a 
  general 
  idea 
  of 
  the 
  variations 
  of 
  

   gravity 
  along 
  the 
  trans-continental 
  line 
  and 
  to 
  compare 
  such 
  

   variations 
  with 
  elevations 
  above 
  the 
  sea. 
  

  

  At 
  a 
  meeting 
  of 
  the 
  National 
  Academy 
  in 
  April, 
  1894, 
  the 
  

   writer 
  presented 
  a 
  brief 
  resume 
  of 
  these 
  results, 
  including 
  a 
  

   diagram 
  showing 
  the 
  departures 
  of 
  actual 
  gravity 
  from 
  what 
  

   might 
  be 
  called 
  normal 
  values. 
  

  

  During 
  the 
  summer 
  of 
  1894 
  a 
  very 
  extended 
  series 
  of 
  gravi- 
  

   tation 
  observations 
  were 
  made, 
  by 
  the 
  new 
  pendulum 
  appara- 
  

   tus 
  of 
  the 
  Coast 
  and 
  Geodetic 
  Survey, 
  by 
  a 
  party 
  in 
  charge 
  of 
  

   Assistant 
  George 
  R. 
  Putnam. 
  An 
  examination 
  of 
  the 
  details 
  

   of 
  the 
  results 
  of 
  this 
  series 
  of 
  observations 
  proves 
  that 
  they 
  

   were 
  very 
  carefully 
  executed, 
  and 
  must 
  be 
  regarded 
  as 
  having 
  

   a 
  high 
  value 
  from 
  the 
  standpoint 
  of 
  accuracy. 
  The 
  results 
  are 
  

   of 
  very 
  great 
  interest, 
  and 
  the 
  special 
  point 
  to 
  which 
  attention 
  

   is 
  now 
  called 
  is 
  the 
  relation 
  of 
  this 
  series 
  of 
  relative 
  values 
  of 
  

   the 
  force 
  of 
  gravity 
  along 
  this 
  great 
  continental 
  arc 
  to 
  the 
  

   various 
  elevations 
  above 
  the 
  sea 
  of 
  the 
  stations 
  at 
  which 
  the 
  

   work 
  was 
  done. 
  Below 
  is 
  a 
  list 
  of 
  the 
  stations 
  occupied, 
  

   arranged 
  in 
  the 
  order 
  of 
  their 
  longitude, 
  beginning 
  with 
  

   Washington, 
  near 
  the 
  Atlantic 
  Coast, 
  and 
  ending 
  with 
  San 
  

   Francisco, 
  Cala. 
  

  

  Abstract 
  of 
  preliminary 
  results 
  of 
  relative 
  gravity 
  observations 
  with 
  half-second 
  

  

  pendulums. 
  

  

  Elevation 
  g, 
  

  

  in 
  g 
  at 
  Sea 
  g,, 
  

  

  Station. 
  Lat. 
  Long. 
  feet, 
  observed. 
  Level. 
  Helmert. 
  g—g,, 
  

  

  Washington 
  38 
  c 
  53' 
  77° 
  00' 
  46 
  980098 
  980-101 
  980047 
  +-054 
  

  

  DeerPark 
  39 
  25 
  79 
  20 
  2515 
  979-921 
  980-068 
  980094 
  —'026 
  

  

  Cleveland 
  41 
  30 
  81 
  40 
  689 
  980*227 
  980-268 
  980-280 
  — 
  012 
  

  

  Chicago 
  4147 
  87 
  36 
  597 
  980-265 
  980-300 
  980306 
  —"006 
  

  

  St. 
  Louis 
  38 
  38 
  90 
  12 
  504 
  979987 
  980 
  017 
  980-024 
  —'007 
  

  

  Kansas 
  City 
  39 
  06 
  94 
  35 
  913 
  979977 
  980-031 
  980-066 
  — 
  -035 
  

  

  Ellsworth 
  . 
  38 
  44 
  98 
  14 
  1470 
  979-912 
  979'999 
  980-033 
  — 
  -034 
  

  

  Wallace 
  38 
  55 
  10135 
  3281 
  979-742 
  979 
  934 
  980'049 
  —'115 
  

  

  Colorado 
  Spgs 
  38 
  50 
  104 
  49 
  6063 
  979-475 
  979-831 
  980-042 
  — 
  -211 
  

  

  Denver. 
  39 
  41 
  104 
  57 
  5375 
  979-595 
  979-910 
  980-117 
  —"207 
  

  

  Pike's 
  Peak 
  38 
  50 
  105 
  02 
  14140 
  978'940 
  979-769 
  980-042 
  —-273 
  

  

  Gunnison 
  38 
  32 
  106 
  55 
  7679 
  979-328 
  979778 
  980-015 
  —-237 
  

  

  Grand 
  Jet... 
  39 
  04 
  108 
  30 
  4570 
  979-620 
  979-887 
  980-063 
  — 
  -176 
  

  

  Green 
  River 
  39 
  00 
  110 
  05 
  4079 
  979622 
  979-861 
  980-057 
  — 
  -196 
  

  

  Grand 
  Canyon 
  ... 
  44 
  43 
  11029 
  7828 
  979885 
  980-344 
  980-571 
  —-227 
  

  

  Norris 
  44 
  44 
  110 
  43 
  7466 
  979-925 
  980-362 
  980-572 
  — 
  -210 
  

  

  Lower 
  Geyser 
  Bas., 
  44 
  33 
  110 
  48 
  7219 
  979-918 
  980-341.980-556 
  — 
  215 
  

  

  Pleasant 
  Valley 
  .. 
  39 
  51 
  11102 
  7187 
  979*499 
  979-920 
  980*132 
  — 
  212 
  

  

  Salt 
  Lake 
  40 
  46 
  111 
  54 
  4340 
  979-790 
  980-044 
  980-214 
  —'170 
  

  

  San 
  Francisco 
  37 
  47 
  122 
  26 
  375 
  979-951 
  979-973 
  979'946 
  +-0265 
  

  

  It 
  will 
  be 
  seen 
  that 
  there 
  was 
  no 
  great 
  variation 
  in 
  latitude 
  

   among 
  these 
  stations, 
  and 
  that 
  in 
  longitude 
  they 
  are 
  quite 
  well 
  

  

  