﻿60 
  [Assembly 
  

  

  The 
  raising 
  money 
  by 
  subscriptions 
  to 
  a 
  loan 
  has 
  thus 
  far 
  been 
  

   successful, 
  and 
  M. 
  Maillefert 
  has 
  thus 
  been 
  afforded 
  the 
  opportu- 
  

   nity 
  of 
  demonstrating 
  the 
  value 
  of 
  his 
  discovery. 
  

  

  In 
  the 
  month 
  of 
  August 
  last 
  he 
  commenced 
  operations 
  in 
  the 
  

   channel 
  of 
  Hurl 
  Gate 
  for 
  breaking 
  down 
  and 
  scattering 
  Pot 
  Rock. 
  

   This 
  rock 
  was 
  one 
  of 
  the 
  most 
  formidable 
  obstructions 
  in 
  that 
  

   great 
  thoroughfare, 
  which 
  for 
  two 
  centuries 
  had 
  been 
  a 
  terror 
  to 
  

   navigators, 
  and 
  for 
  near 
  a 
  century 
  has 
  been 
  a 
  reproach 
  to 
  the 
  

   country, 
  for 
  the 
  reason 
  that 
  no 
  measures 
  were 
  taken 
  to 
  remove 
  it. 
  

  

  At 
  the 
  depth 
  of 
  twenty-four 
  feet 
  below 
  mean 
  low 
  water 
  its 
  

   length 
  was 
  two 
  hundred 
  and 
  twenty-five 
  feet, 
  and 
  width 
  sixty 
  

   feet. 
  It 
  had 
  a 
  depth 
  of 
  water 
  on 
  one 
  side 
  of 
  sixty-two 
  feet, 
  and 
  

   on 
  the 
  other 
  of 
  sixty 
  feet. 
  Its 
  height 
  was 
  fifty- 
  two 
  feet 
  — 
  its 
  apex 
  

   reaching 
  to 
  within 
  eight 
  feet 
  of 
  the 
  surface 
  of 
  the 
  water. 
  Its 
  po- 
  

   sition 
  was 
  about 
  midway 
  in 
  the 
  channel 
  where 
  the 
  current 
  was 
  

   very 
  rapid, 
  and 
  a 
  large 
  and 
  dangerous 
  whirlpool 
  was 
  formed 
  

   by 
  it. 
  

  

  On 
  the 
  20th 
  of 
  August 
  two 
  charges 
  of 
  78 
  lbs. 
  each 
  were 
  fired 
  

   on 
  this 
  rock, 
  which 
  destroyed 
  four 
  feet 
  in 
  length 
  of 
  its 
  top, 
  and 
  

   when 
  twelve 
  charges 
  had 
  been 
  fired 
  the 
  whirlpool 
  disappeared. 
  

  

  From 
  the 
  20th 
  of 
  August 
  to 
  the 
  7th 
  of 
  November 
  one 
  hundred 
  

   and 
  forty-three 
  submarine 
  charges 
  were 
  fired 
  upon 
  Pot 
  Rock. 
  

   Twenty-seven 
  of 
  these 
  were 
  of 
  78 
  lbs. 
  each, 
  the 
  residue 
  of 
  one 
  

   hundred 
  and 
  twenty-five 
  pounds 
  each. 
  The 
  aggregate 
  weight 
  of 
  

   the 
  one 
  hundred 
  and 
  forty-three 
  charges 
  was 
  sixteen 
  thousand 
  six 
  

   hundred 
  and 
  six 
  pounds. 
  

  

  On 
  the 
  7th 
  of 
  November, 
  Lt. 
  W. 
  A. 
  Bartlett, 
  U. 
  S. 
  N. 
  and 
  Asst. 
  

   in 
  the 
  Coast 
  Survey, 
  who 
  had 
  been 
  detailed 
  by 
  Professor 
  A. 
  D. 
  

   Bache, 
  Supt. 
  of 
  the 
  U. 
  S. 
  Coast 
  Survey, 
  to 
  make 
  surveys 
  in 
  Hurl 
  

   Gate, 
  made 
  a 
  survey 
  of 
  Pot 
  Rock. 
  The 
  following 
  communication 
  

   from 
  him 
  states 
  the 
  result 
  of 
  his 
  examination 
  : 
  

  

  " 
  Hell 
  Gate, 
  ^ 
  P. 
  M., 
  Friday, 
  JVov. 
  1th, 
  1851. 
  

  

  " 
  Mr. 
  Meriam 
  : 
  Dear 
  Sir 
  — 
  I 
  have 
  made 
  a 
  very 
  complete 
  exa- 
  

   mination 
  of 
  Pot 
  Rock 
  at 
  low 
  tide 
  to 
  day. 
  I 
  have 
  to 
  say 
  now 
  in 
  

  

  