﻿THE 
  UNFELT 
  EARTHQUAKE. 
  241 
  

  

  great 
  that 
  no 
  impression 
  was 
  made 
  on 
  the 
  sensitised 
  paper 
  f 
  and 
  

   from 
  Grenoble 
  I 
  have 
  no 
  details. 
  

  

  The 
  bifilar 
  pendulum 
  is 
  not 
  intended 
  to 
  respond 
  to 
  anything 
  but 
  

   a 
  tilt 
  of 
  the 
  instrument 
  as 
  a 
  whole, 
  but 
  it 
  is 
  evident, 
  from 
  the 
  time 
  of 
  

   commencement 
  of 
  the 
  preliminary 
  tremors, 
  that 
  the 
  movement 
  of 
  the 
  

   first 
  phase 
  was 
  sufficiently 
  great 
  to 
  affect 
  the 
  instrument, 
  while 
  the 
  

   commencement 
  of 
  the 
  larger 
  displacements 
  indicates 
  the 
  commence- 
  

   ment 
  of 
  the 
  second 
  phase. 
  The 
  time 
  of 
  maximum 
  movement 
  cannot 
  

   be 
  decided, 
  as 
  at 
  that 
  period 
  the 
  displacements 
  were 
  beyond 
  the 
  

   range 
  of 
  recording 
  power 
  of 
  the 
  instrument* 
  

  

  Turning 
  to 
  the 
  magnetic 
  instruments, 
  I 
  have 
  been 
  able 
  to 
  collect 
  

   the 
  following 
  information. 
  

  

  Bombay.— 
  A 
  description 
  of 
  the 
  effect 
  of 
  the 
  earthquake 
  on 
  the 
  

   traces 
  of 
  the 
  self-recording 
  instruments 
  at 
  the 
  Colaba 
  Observatory 
  

   has 
  been 
  given 
  in 
  Chapter 
  XI. 
  The 
  main 
  results 
  may 
  be 
  epito* 
  

   mised 
  here 
  and 
  the 
  times 
  converted 
  into 
  G. 
  M. 
  T. 
  : 
  — 
  

  

  Declination, 
  commencement 
  nh. 
  1275m. 
  end 
  1 
  ih. 
  4175m. 
  the 
  

  

  trace 
  is 
  lost 
  between 
  nh. 
  1475m. 
  and 
  nh. 
  1675m. 
  

   Horizontal 
  force, 
  commencement 
  of 
  disturbance 
  uh. 
  11*25111. 
  

   end 
  nh. 
  4475m. 
  trace 
  lost 
  between 
  nh. 
  14*25111. 
  and 
  nh. 
  

   28*25111. 
  

   Vertical 
  force, 
  commencement 
  disturbance 
  nh. 
  I5*25m. 
  end 
  

   nh, 
  2275m. 
  maximum 
  at 
  1 
  ih. 
  1675m. 
  and 
  a 
  second 
  minor 
  

   one 
  at 
  1 
  ih. 
  2075m. 
  

   Barograph, 
  commencement 
  of 
  disturbance, 
  nh. 
  14*25111. 
  end 
  

  

  ilh. 
  21*25111. 
  maximum 
  at 
  nh. 
  18*25 
  h. 
  

   Batavia. 
  — 
  At 
  Batavia 
  the 
  magnetic 
  and 
  electric 
  instruments 
  were 
  

   affected 
  by 
  the 
  shock. 
  The 
  times 
  taken 
  from 
  the 
  original 
  records, 
  

   for 
  which 
  I 
  am 
  indebted 
  to 
  Dr. 
  S. 
  Figee, 
  are 
  as 
  follows 
  :— 
  

  

  Declination, 
  Shocks, 
  almost 
  imperceptible, 
  at 
  uh, 
  22m., 
  G. 
  M. 
  

  

  T,, 
  and 
  others 
  afterwards 
  until 
  nh. 
  32m. 
  

   R 
  ( 
  24I 
  \ 
  

  

  