30 WATER POWER OF HALIFAX COUNTY, NOVA SCOTIA: 



they can reach in practical work. The hiri>-e Avheel is rated at 

 85 per cent, officioncv and the other two at SO ])er cent. 



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

 75 " '• 465 " 31 " = 20.25 



75 " .• 24!»2 " 31 " = 109.5 



The Starr Compaiaj was under contract to supply power to 

 the Electric Light Company np to 100 horse-]XJwer 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 en. ft. per minute x 60 x 9 hours = 1 153,560 cu. ft. per day. 

 2492 '■ " 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 195-1-29.25=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, efficie'ncy, 116.75 horse-power for twenty-four 

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

 power would be an increa.se 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 runniing the Starr w^orks 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- 



