COS 



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 2500 

 cubic feet per second in the river. 



The power station is constructed of Potsdam sandstone and 

 steel. The penstock pipes are of steel, nr-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- 

 kiloAvatt 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, having a movable plate between the fares. 

 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 1000 volts at Potsdam, where it would be 

 stepped down for transmission to consumers. The 20.000 volt line 



