30 WATER POWER OF HALIFAX COUNTY, NOVA SCOTIA : 



they can reach in practical work. The large wheel is rated at 

 85 per cent, efficiency and the other two at 80 per cent. 



At 75 per cent, efficiency 1674 cu. ft. at 31 ft. head = 73.5 horse-power. 

 75 " ' 465 " 31 " = 20.25 



75 " .' 2492 " 31 " = 109.5 



The Starr Company was under contract to supply power to 

 the Electric Light Company up to 100 horse-power from sunset 

 to midnight, and 30 horse-power from midnight to dawn. It is 

 estimated, therefore; that the average quantity of water con- 

 sumed per day in developing power was : 

 1674 

 465 



2139 cu. ft. per minute x 60 x 9 hours = 1 153,560 cu. ft. per day. 

 2482 " " x60x6 " = 897,120 



1134 " " x60x5 " =2,390,880 " 



This quantity used at an equal hourly rate for twenty-four 

 hours would produce 73 horse-power at 75 per cent, efficiency. 

 Adding the 29.25 horse-power developed below, the total 24- 

 hour power would be 99.25 horse-power. For nine hours it 

 would produce 195+29.25=224.25 horse-power. 



Assuming for the present that the quantity of water used 

 daily is correct, it is not developing the total horse-power that 

 it is capable of producing. If, instead of the present system, 

 all of the water were carried in a pipe from Sullivan's Pond to 

 a wheel at the electric light station, there would be a head of at 

 least fifty feet. The above quantity of water would then develop 

 at 75 per cent, efficiency, 116.75 horse-power for twenty-four 

 hours, or 314.25 horse-power for nine hours. The nine-hour 

 power would be an increase of 90 horse-power, or 40 per cent. 

 In order to obtain this additional power it would be necessary to 

 coinvert the hydraulic plant now running the Starr works into 

 a hydro-electric plant. 



The same water used for power at the Starr works is available 

 for the development of power at the foot of First Lake, as Sul- 



