﻿828 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Mr 
  Child's 
  measurements 
  were 
  for 
  a 
  section 
  of 
  the 
  canal 
  

   36.02 
  miles 
  in 
  length. 
  On 
  the 
  Palmyra 
  level, 
  for 
  a 
  distance 
  of 
  

   8.34 
  miles, 
  where 
  the 
  soil 
  is 
  open 
  and 
  porous, 
  the 
  measurements 
  

   showed 
  a 
  loss 
  of 
  1.81 
  cubic 
  feet 
  per 
  second 
  per 
  mile. 
  On 
  the 
  

   Clyde 
  level 
  with 
  a 
  more 
  retentive 
  soil 
  the 
  losses 
  from 
  filtration, 
  

   absorption, 
  and 
  evaporation 
  were, 
  for 
  a 
  distance 
  of 
  27.68 
  miles, 
  

   only 
  0.59 
  cubic 
  foot 
  per 
  second 
  per 
  mile. 
  The 
  entire 
  loss, 
  includ- 
  

   ing 
  leakage, 
  was, 
  for 
  the 
  whole 
  distance, 
  1.40 
  cubic 
  feet 
  per 
  

   second 
  per 
  mile. 
  These 
  measurements 
  were 
  made 
  for 
  a 
  term 
  of 
  

   thirty-three 
  days, 
  from 
  July 
  30 
  to 
  August 
  31, 
  inclusive. 
  Meas- 
  

   urements 
  were 
  also 
  made 
  in 
  June, 
  early 
  in. 
  July, 
  and 
  in 
  the 
  fol- 
  

   lowing 
  October, 
  from 
  which 
  the* 
  conclusion 
  was 
  derived 
  that 
  

   demands 
  were 
  greater 
  and 
  the 
  supply 
  less 
  for 
  the 
  time 
  during 
  

   which 
  the 
  foregoing 
  observations 
  were 
  taken 
  than 
  during 
  any 
  

   other 
  portion 
  of 
  the 
  season. 
  

  

  Mr 
  Barrett's 
  measurements 
  were 
  made 
  at 
  various 
  points 
  on 
  the 
  

   original 
  canal 
  between 
  Pittsford 
  and 
  Lockport, 
  and 
  repeated 
  each 
  

   day 
  from 
  July 
  17 
  to 
  September 
  30, 
  inclusive. 
  They 
  showed 
  au 
  

   average 
  loss 
  for 
  the 
  whole 
  period 
  of 
  1.22 
  cubic 
  feet 
  per 
  second 
  

   per 
  mile. 
  Assuming 
  the 
  same 
  ratio 
  of 
  loss 
  between 
  Pittsford 
  

   and 
  Wayneport, 
  there 
  resulted, 
  for 
  the 
  entire 
  distance 
  of 
  122 
  

   miles 
  from 
  Lockport 
  to 
  Pit 
  lock, 
  an 
  average 
  loss 
  of 
  1.12 
  cubic 
  

   feet 
  per 
  second 
  per 
  mile. 
  Mr 
  Childs 
  states 
  that 
  an 
  addition 
  to 
  

   the 
  foregoing 
  quantity 
  should 
  be 
  made 
  as 
  an 
  allowance 
  for 
  

   springs 
  and 
  several 
  small 
  streams 
  entering 
  the 
  canal 
  which 
  

   could 
  not 
  be 
  measured. 
  Making 
  such 
  additions 
  he 
  concludes 
  

   that 
  1.42 
  cubic 
  feet 
  per 
  second 
  per 
  mile 
  should 
  be 
  taken 
  as 
  the 
  

   total 
  quantity 
  consumed 
  on 
  the 
  122 
  miles 
  of 
  canal 
  under 
  con- 
  

   sideration, 
  which 
  is 
  equivalent 
  to 
  a 
  total 
  of 
  173 
  cubic 
  feet 
  per 
  

   second. 
  It 
  is 
  stated 
  in 
  the 
  original 
  reports 
  that 
  the 
  supply 
  of 
  

   water 
  was 
  ample 
  for 
  all 
  the 
  purposes 
  of 
  navigation 
  during 
  these 
  

   measurements. 
  

  

  Comparing 
  Mr 
  Childs's 
  measurements 
  of 
  1841 
  with 
  those 
  made 
  

   by 
  Messrs 
  Jervis 
  and 
  Bates 
  in 
  1824, 
  one 
  point 
  of 
  great 
  practical 
  

   utility 
  is 
  strongly 
  brought 
  out, 
  namely, 
  as 
  to 
  the 
  excess 
  of 
  loss 
  

   of 
  water 
  in 
  new 
  canals 
  over 
  those 
  some 
  time 
  in 
  use 
  ; 
  thus 
  Mr 
  Bates 
  

  

  