﻿352 
  

  

  OLDHAM: 
  GREAT 
  EARTHQUAKE 
  OF 
  1897. 
  

  

  Another 
  principle 
  that 
  was 
  accepted 
  as 
  a 
  guiding 
  one, 
  was 
  that 
  there 
  was 
  no 
  

   use 
  in 
  reobserving 
  what 
  are 
  known 
  as 
  Tower 
  Stations 
  ; 
  that 
  is 
  stations 
  where, 
  in 
  the 
  

   absence 
  of 
  natural 
  elevations, 
  brick 
  towers 
  had 
  been 
  built 
  on 
  the 
  alluvium, 
  from 
  

   which 
  to 
  observe. 
  If 
  retriangulation 
  was 
  necessary 
  for 
  geodetic 
  purposes, 
  all 
  these 
  

   stations 
  would 
  require 
  refixing, 
  for 
  within 
  the 
  area 
  over 
  which 
  earth 
  fissures 
  were 
  

   formed, 
  it 
  would 
  be 
  impossible 
  to 
  assume 
  that 
  any 
  of 
  them 
  had 
  not 
  been 
  disturbed 
  

   by 
  displacements 
  of 
  the 
  alluvium 
  on 
  which 
  they 
  rested, 
  and 
  this 
  quite 
  independent 
  

   of 
  any 
  change 
  or 
  absence 
  of 
  change 
  in 
  the 
  underlying 
  rock. 
  

  

  A 
  group 
  of 
  triangles 
  extending 
  northwards 
  from 
  the 
  southern 
  margin 
  of 
  the 
  

   Khasi 
  Hills 
  was 
  accordingly 
  selected, 
  and 
  as 
  there 
  happened 
  to 
  be 
  an 
  isolated 
  hill 
  

   in 
  the 
  Sylhet 
  plain, 
  Taramun 
  Tila, 
  which 
  had 
  been 
  selected 
  as 
  one 
  of 
  the 
  points 
  

   the 
  original 
  primary 
  triangulation, 
  it 
  was 
  decided 
  to 
  include 
  this. 
  

  

  These 
  preliminaries 
  having 
  been 
  arranged 
  the 
  work 
  was 
  taken 
  in 
  hand 
  by 
  

   Mr. 
  J. 
  Bond, 
  Extra 
  Assistant 
  Superintendent, 
  and 
  the 
  results 
  have 
  been 
  embodied 
  

   in 
  a 
  report 
  by 
  Major 
  Burrard, 
  from 
  which 
  the 
  following 
  tabular 
  statements 
  of 
  the 
  

   changes 
  observed 
  are 
  taken. 
  

  

  Changes 
  in 
  length 
  of 
  sides. 
  

  

  Side. 
  

  

  i860 
  value. 
  

  

  1898 
  value. 
  

  

  Difference. 
  

  

  

  Feet. 
  

  

  Feet. 
  

  

  Feet. 
  

  

  Taramun 
  Tila 
  — 
  Mopen 
  

  

  

  

  

  99101*5 
  

  

  99106*3 
  

  

  + 
  4*8 
  

  

  Mopen— 
  Rangsanobo 
  . 
  

  

  

  

  

  95013*1 
  

  

  95018*0 
  

  

  + 
  4-9 
  

  

  Rangsanobo— 
  Thanjinath 
  

  

  

  

  

  60421*3 
  

  

  60424*7 
  

  

  + 
  3*4 
  

  

  Mopen 
  — 
  Mosingi 
  . 
  

  

  

  

  

  65344*6 
  

  

  65344*6 
  

  

  o'o 
  

  

  Rangsanobo 
  — 
  Mosingi 
  . 
  

  

  

  

  

  54152-5 
  

  

  54154*8 
  

  

  + 
  2"3 
  

  

  Rangsanobo— 
  Mun 
  

  

  

  

  

  678927 
  

  

  67895*9 
  

  

  +3*2 
  

  

  Thanjinath 
  — 
  Mun 
  • 
  • 
  

  

  

  

  

  47S8 
  4 
  -i 
  

  

  47884*0 
  

  

  — 
  0*1 
  

  

  Mosingi 
  — 
  Mun 
  

  

  

  

  

  84893-2 
  

  

  84897-6 
  

  

  + 
  4*4 
  

  

  Mosingi— 
  Mautherrichan 
  , 
  

  

  

  

  

  83931*8 
  

  

  83933 
  "o 
  

  

  + 
  T2 
  

  

  Mosingi 
  — 
  Laidera 
  . 
  

  

  

  

  

  64350'8 
  

  

  64353*4 
  

  

  + 
  2*6 
  

  

  Mun— 
  Laidera 
  . 
  . 
  

  

  

  

  

  630077 
  

  

  63007-4 
  

  

  — 
  0*3 
  

  

  Mun 
  — 
  Dinghei 
  

  

  

  

  

  72i54'3 
  

  

  72156-7 
  

  

  + 
  2*4 
  

  

  Laidera— 
  Mautherrichan 
  . 
  

  

  

  

  

  72373*1 
  

  

  72377*o 
  

  

  + 
  3-9 
  

  

  Laidera 
  — 
  Dinghei 
  . 
  

  

  

  

  

  57583*0 
  

  

  57584*1 
  

  

  + 
  1*1 
  

  

  Mautherrichan— 
  Landau 
  Modo 
  , 
  

  

  

  

  50746*7 
  

  

  50755*3 
  

  

  + 
  8-6 
  

  

  Dinghei 
  — 
  Umter 
  . 
  . 
  

  

  

  

  

  75209*0 
  

  

  752U'3 
  

  

  4 
  2*3 
  

  

  ( 
  362 
  ) 
  

  

  