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NEW YORK STATE MUSEUM 



opposite sides of an island. The left wing has a crest length of 

 380 feet, while the right wing has a crest 280 feet long. The dis- 

 charge over the main dam has been calculated by means of a 

 coefficient determined in Cornell University experiment No. 18, 

 representing a cross-section nearly identical with that of the 

 West Troy Water Company's dam. With a rise of 5 feet on the 

 gage, the water begins to flow over a masonry racewall. The dis- 

 charge over this portion lias been computed from Cornell Univer- 

 sity experiment No. 12, as detailed in the paper On the Flow of 

 Water Over Dams. Plate 9 shows the dam on the Mohawk river 

 at Dunsbaeh Ferry. 



Discharge measurements of Mohawk river at Rexford Flats. 

 This station is located at the canal feeder dam four miles below 

 Schenectady, where there is a masonry dam with a timber apron. 

 Experiments on the Rexford Flats cross-section were made at Cor- 

 nell University. The following cut shows the dam on Mohawk 

 river at Rexford Flats : 



Fig. 28 Dam on Mohawk river at Rexford Flats. 



Discharge measurementts of Mohawk river al Utile Fells. This 

 gaging station is located at the lower or Gilbert's dam at Little 

 Falls. It is a circular dam of masonry, furnishing power for the 

 Astoronga Knitting Mill and the Little Falls Paper Company's 

 Mills. There are six water wheels in these two mills, of which 

 the records are kept. The following cut shows a section of this 

 dam : 



