﻿HYDROLOGY 
  OP 
  NEW 
  YORK 
  329 
  

  

  run, 
  working 
  head 
  on 
  wheels, 
  readings 
  of 
  head-race 
  and 
  tail-race 
  

   gages, 
  and 
  other 
  information 
  necessary 
  for 
  keeping 
  an 
  accurate 
  

   account 
  of 
  the 
  water 
  passing 
  over 
  the 
  crest 
  in 
  24 
  hours, 
  as 
  well 
  

   as 
  through 
  water 
  wheels 
  for 
  the 
  same 
  period. 
  Gage 
  readers 
  were 
  

   employed 
  to 
  take 
  these 
  readings 
  twice 
  each 
  day. 
  

  

  In 
  order 
  to 
  obtain 
  flows 
  through 
  water 
  wheels, 
  recourse 
  was 
  

   had 
  to 
  records 
  of 
  the 
  test 
  flume 
  of 
  the 
  Holyoke 
  Water 
  Power 
  Com- 
  

   pany 
  of 
  Holyoke, 
  Mass., 
  where 
  the 
  principal 
  wheels 
  now 
  in 
  com- 
  

   mon 
  use 
  in 
  New 
  York 
  State 
  have, 
  at 
  one 
  time 
  or 
  another, 
  been 
  

   tested. 
  On 
  requesting 
  a 
  record 
  of 
  such 
  tests, 
  as 
  applying 
  to 
  

   wheels 
  at 
  the 
  several 
  gaging 
  stations, 
  the 
  Holyoke 
  Water 
  Power 
  

   Company 
  responded 
  that 
  they 
  would 
  furnish 
  the 
  records 
  under 
  

   the 
  condition 
  that 
  they 
  be 
  not 
  published 
  unless 
  the 
  consent 
  of 
  

   parties 
  for 
  whom 
  the 
  wheels 
  had 
  been 
  tested 
  were 
  first 
  obtained. 
  

   This 
  condition 
  being 
  assented 
  to, 
  information 
  was 
  furnished 
  as 
  

   to 
  tests 
  of 
  the 
  principal 
  wheels 
  in 
  use, 
  giving 
  proportional 
  part 
  

   of 
  opening 
  of 
  speed 
  gate 
  for 
  various 
  conditions 
  of 
  tests, 
  revolu- 
  

   tions 
  of 
  wheel, 
  quantity 
  of 
  water 
  discharged, 
  power 
  developed, 
  

   efficiency, 
  etc. 
  From 
  these 
  records, 
  wheel-discharge 
  curves 
  have 
  

   been 
  prepared 
  for 
  the 
  water 
  wheels 
  in 
  use 
  at 
  each 
  dam. 
  By 
  the 
  

   use 
  of 
  such 
  curves, 
  derived 
  from 
  actual 
  tests, 
  it 
  is 
  believed 
  that 
  

   the 
  discharges 
  through 
  turbine 
  water 
  wheels 
  at 
  the 
  various 
  gaging 
  

   stations 
  have 
  been 
  computed 
  with 
  a 
  very 
  high 
  degree 
  of 
  accuracy. 
  

   Under 
  these 
  conditions 
  turbine 
  water 
  wheels 
  become 
  in 
  effect 
  

   efficient 
  water 
  meters. 
  In 
  a 
  few 
  cases, 
  where 
  there 
  were 
  no 
  tests 
  

   applying, 
  the 
  discharges 
  as 
  per 
  manufacturers' 
  tables 
  have 
  been 
  

   used. 
  The 
  writer's 
  thanks 
  are 
  due 
  to 
  the 
  Holyoke 
  Water 
  Power 
  

   Company 
  for 
  the 
  courtesy 
  of 
  furnishing 
  these 
  useful 
  data. 
  

  

  The 
  work 
  of 
  Henry 
  Bazin. 
  In 
  order 
  to 
  apply 
  the 
  results 
  of 
  

   these 
  gagings, 
  the 
  work 
  of 
  Henry 
  Bazin, 
  Inspecteur 
  General 
  cles 
  

   Ponts 
  ei 
  Cliaussees, 
  which 
  may 
  be 
  found 
  in 
  Annales 
  des 
  Fonts 
  et 
  

   Chaussees, 
  for 
  the 
  years 
  1888, 
  1890, 
  1891, 
  1894, 
  1896 
  and 
  1898, 
  is 
  

   used. 
  In 
  these 
  papers 
  Bazin 
  has 
  determined 
  coefficients 
  for 
  a 
  large 
  

   number 
  of 
  cases, 
  not 
  only 
  of 
  crests 
  of 
  different 
  widths, 
  but 
  with 
  

   varying 
  front 
  and 
  rear 
  slopes, 
  as 
  well 
  as 
  for 
  curved 
  profiles. 
  

   Indeed, 
  taking 
  into 
  account 
  the 
  backward 
  state 
  of 
  knowledge 
  of 
  

   flow 
  over 
  weirs, 
  his 
  work 
  is 
  in 
  many 
  respects 
  revolutionary. 
  

  

  

  