﻿668 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  The 
  canal 
  is 
  about 
  2700 
  feet 
  long 
  and 
  20 
  feet 
  deep 
  from 
  the 
  top 
  

   of 
  the 
  banks, 
  the 
  bottom 
  being 
  14 
  feet 
  below 
  the 
  crest 
  of 
  the 
  dam. 
  

   The 
  bottom 
  width 
  of 
  the 
  canal 
  is 
  30 
  feet 
  and 
  the 
  top 
  width 
  110 
  

   feet. 
  

  

  The 
  Hannawa 
  Falls 
  Water 
  Power 
  Company, 
  in 
  cooperation 
  

   with 
  other 
  waterpower 
  owners 
  on 
  the 
  Raquette 
  river, 
  expect 
  to 
  

   construct 
  reservoirs 
  which 
  will 
  maintain 
  a 
  constant 
  flow 
  of 
  2506 
  

   cubic 
  feet 
  per 
  second 
  in 
  the 
  river. 
  

  

  The 
  power 
  station 
  is 
  constructed 
  of 
  Potsdam 
  sandstone 
  and 
  

   steel. 
  The 
  penstock 
  pipes 
  are 
  of 
  steel, 
  TV-inch 
  and 
  f-inch 
  in 
  

   thickness. 
  At 
  present 
  (1904) 
  there 
  is 
  only 
  one 
  water-wheel 
  set 
  

   for 
  the 
  electrical 
  equipment. 
  This 
  wheel 
  is 
  a 
  1250-horsepower 
  

   horizontal 
  water-wheel, 
  built 
  by 
  James 
  Leffel 
  & 
  Company. 
  At 
  

   each 
  end 
  of 
  the 
  horizontal 
  shaft 
  there 
  is 
  a 
  direct 
  connected 
  350- 
  

   kilowatt 
  three-phase 
  4400-volt 
  generator. 
  There 
  is 
  also 
  an 
  oppor- 
  

   tunity 
  to 
  set 
  three 
  other 
  similar 
  wheels. 
  

  

  The 
  two 
  350-kilowatt 
  generators 
  are 
  connected 
  to 
  the 
  wheel 
  

   shaft 
  by 
  plate 
  couplings, 
  haviDg 
  a 
  movable 
  plate 
  between 
  the 
  faces. 
  

   They 
  are 
  of 
  the 
  revolving 
  field 
  type, 
  having 
  24 
  poles 
  and 
  deliver- 
  

   ing 
  three-phase 
  current 
  at 
  a 
  frequency, 
  of 
  60 
  periods 
  per 
  second 
  

   and 
  a 
  pressure 
  of 
  4400 
  volts. 
  They 
  run 
  at 
  300 
  revolutions 
  per 
  

   minute 
  and 
  are 
  excited 
  by 
  two 
  belted 
  exciters, 
  each 
  of 
  sufficient 
  

   capacity 
  to 
  supply 
  both 
  generators. 
  

  

  The 
  switchboard 
  of 
  Vermont 
  marble 
  consists 
  of 
  two 
  generator 
  

   panels 
  with 
  indicating 
  instruments, 
  one 
  exciter 
  panel 
  with 
  

   switches 
  and 
  instruments 
  for 
  both 
  exciters, 
  two 
  4400-volt 
  feeder 
  

   panels, 
  with 
  relay, 
  circuit 
  breakers, 
  oil 
  break 
  switches, 
  and 
  watt- 
  

   meters, 
  one 
  220-volt 
  panel 
  with 
  seven 
  distributing 
  switches, 
  one 
  

   transformer 
  panel, 
  and 
  one 
  20,000-volt 
  panel 
  with 
  three 
  quick- 
  

   break 
  switches 
  having 
  marble 
  barriers. 
  

  

  The 
  Hannawa 
  Falls 
  Water 
  Power 
  Company 
  owns 
  the 
  electric 
  

   lighting 
  plant 
  in 
  the 
  village 
  of 
  Potsdam, 
  4^ 
  miles 
  from 
  the 
  sta- 
  

   tion, 
  with 
  which 
  village 
  it 
  is 
  connected 
  by 
  a 
  double 
  line, 
  which 
  

   consists 
  of 
  three 
  cables 
  of 
  seven 
  strands 
  each, 
  of 
  aluminum 
  wire. 
  

   This 
  line 
  was 
  computed 
  to 
  transmit 
  375 
  kilowatts 
  with 
  a 
  drop 
  of 
  

   400 
  volts, 
  delivering 
  4000 
  volts 
  at 
  Potsdam, 
  where 
  it 
  would 
  be 
  

   stepped 
  down 
  for 
  transmission 
  to 
  consumers. 
  The 
  20,000-volt 
  line 
  

  

  