﻿APPENDIX 
  G. 
  365 
  

  

  For 
  the 
  results 
  tabulated 
  above 
  the 
  side 
  Rangsanobo 
  — 
  Taramun 
  Til 
  a 
  was 
  

   adopted 
  as 
  the 
  initial 
  base 
  for 
  the 
  triangulation, 
  and 
  the 
  height 
  of 
  

   Rangsanobo 
  as 
  the 
  initial 
  height, 
  Mr. 
  Oldham 
  being 
  of 
  opinion 
  that 
  

   these 
  southerly 
  stations 
  are 
  least 
  likely 
  to 
  have 
  been 
  affected." 
  

  

  On 
  which 
  I 
  need 
  only 
  remark 
  that 
  I 
  am 
  still 
  of 
  the 
  same 
  opinion, 
  but 
  consider 
  

   that 
  it 
  should 
  have 
  led 
  to 
  the 
  adoption 
  of 
  Taramun 
  Tila 
  rather 
  than 
  Rangsanobo 
  

   as 
  the 
  starting 
  point 
  to 
  which 
  changes 
  of 
  elevation 
  should 
  be 
  referred. 
  

  

  I 
  had 
  suggested 
  that, 
  as 
  compression 
  in 
  a 
  north-south 
  direction 
  was 
  to 
  be 
  

   expected, 
  while 
  compression 
  in 
  an 
  east-west 
  direction 
  was 
  less 
  likely 
  to 
  be 
  met 
  

   with, 
  the 
  assumed 
  fixed 
  base 
  should 
  be 
  a 
  side 
  of 
  a 
  triangle 
  bearing 
  about 
  east 
  and 
  

   west. 
  In 
  the 
  final 
  calculations 
  the 
  side 
  Rangsanobo-Taramun 
  Tila 
  was 
  adopted 
  

   as 
  the 
  base, 
  but 
  whether 
  from 
  a 
  desire 
  to 
  adopt 
  a 
  base 
  of 
  which 
  one 
  extremity 
  

   might 
  be 
  considered 
  as 
  unchanged, 
  or 
  for 
  convenience 
  of 
  calculation, 
  or 
  because 
  

   it 
  gives 
  the 
  smallest 
  amount 
  of 
  general 
  displacement, 
  there 
  is 
  nothing 
  to 
  show. 
  

   What 
  now 
  remains 
  to 
  be 
  investigated 
  is 
  the 
  probability 
  of 
  any 
  change 
  having 
  

   taken 
  place 
  in 
  the 
  length 
  of 
  this 
  side, 
  and 
  the 
  effects 
  such 
  change 
  would 
  have 
  on 
  

   the 
  deduced 
  values 
  of 
  other 
  stations. 
  

  

  Taramun 
  Tila 
  is 
  a 
  small 
  hill 
  of 
  tertiary 
  beds, 
  rising 
  out 
  of 
  the 
  Sylhet 
  plain 
  

   near 
  Chhatak. 
  It 
  lies 
  outside 
  what 
  I 
  believe 
  to 
  be 
  the 
  limits 
  of 
  the 
  epifocal 
  

   area 
  and, 
  as 
  it 
  is 
  a 
  hill 
  station, 
  is 
  not 
  liable 
  to 
  the 
  displacement 
  which 
  would 
  

   probably 
  have 
  affected 
  a 
  station 
  built 
  on 
  the 
  alluvium 
  in 
  this 
  neighbourhood. 
  

   The 
  position 
  and 
  height 
  of 
  Taramun 
  Tila 
  may 
  consequently 
  be 
  regarded, 
  with 
  

   considerable 
  probability, 
  as 
  unaltered. 
  

  

  Rangsanobo, 
  on 
  the 
  other 
  hand, 
  lies 
  near 
  the 
  southern 
  edge 
  of 
  the 
  Khasi 
  Hills, 
  

   and 
  apparently 
  within 
  the 
  limits 
  of 
  the 
  epifocal 
  area. 
  In 
  this 
  case 
  a 
  displacement 
  

   is 
  probable, 
  and 
  this 
  would 
  probably 
  be 
  such 
  as 
  to 
  cause 
  a 
  shortening 
  of 
  the 
  

   distance 
  between 
  it 
  and 
  Taramun 
  Tila. 
  Consequently 
  it 
  is 
  probable 
  that 
  the 
  

   present 
  length 
  of 
  this 
  side 
  is 
  shorter 
  than 
  of 
  old. 
  

  

  The 
  effect 
  of 
  this 
  shortening 
  would 
  be 
  to 
  increase 
  the 
  apparent 
  length 
  of 
  all 
  

   other 
  sides, 
  for, 
  the 
  base 
  being 
  assumed 
  to 
  be 
  greater 
  than 
  it 
  really 
  is, 
  this 
  would 
  

   lead 
  to 
  the 
  other 
  sides 
  being 
  calculated 
  as 
  larger 
  than 
  their 
  true 
  length, 
  in 
  a 
  

   corresponding 
  degree. 
  Moreover, 
  as 
  the 
  error 
  would 
  be 
  cumulative 
  it 
  would 
  lead 
  

   to 
  just 
  such 
  a 
  stretching 
  out 
  of 
  the 
  ground 
  as 
  seems 
  to 
  be 
  indicated 
  by 
  the 
  

   tabulated 
  results. 
  

  

  The 
  supposition 
  that 
  the 
  apparent 
  stretching 
  of 
  the 
  hills 
  is 
  really 
  due 
  to 
  the 
  

   adoption 
  of 
  too 
  high 
  a 
  value 
  of 
  the 
  initial 
  base, 
  is 
  confirmed 
  on 
  a 
  more 
  detailed 
  

   examination 
  of 
  the 
  tabulated 
  changes. 
  

  

  It 
  will 
  be 
  noticed 
  that 
  the 
  sides 
  Mopen— 
  Rangsanobo— 
  Thanjinath, 
  which 
  run 
  

   nearly 
  east 
  and 
  west, 
  have 
  apparently 
  lengthened 
  4*9 
  feet 
  and 
  3-4 
  feet, 
  respectively. 
  

   Connecting 
  these 
  three 
  stations 
  with 
  Mosingi 
  and 
  Mun, 
  we 
  have 
  four 
  sides 
  with 
  a 
  

   considerable 
  amount 
  of 
  northerly 
  departure 
  in 
  them. 
  Of 
  these 
  one 
  appears 
  to 
  

   have 
  shortened 
  1 
  foot, 
  another 
  is 
  unchanged, 
  and 
  the 
  remaining 
  two 
  have 
  

   lengthened 
  2*3 
  and 
  3*2 
  feet, 
  respectively. 
  Here 
  the 
  increased 
  length 
  which 
  should 
  

   have 
  been 
  found 
  if 
  the 
  shape 
  of 
  the 
  triangles 
  had 
  been 
  unaltered, 
  is 
  greatly 
  

  

  ( 
  365 
  ) 
  

  

  