Mance: Quarry Industry of Southern hidiana 



135 



current dynamo driving the cranes. The plant has a full load 

 capacity of 175 horse-power, but the calculations have been made 

 on three-fourths load. 



Cost of equipment new — 



Building, just power-house $600 . 00 



Boiler, water-tube, 153 rated 1 , 850 . 00 



Foundation for boiler 1 60 . 00 



Brick work for boiler 500 . 00 



Iron work for boiler 250.00 



Stack delivered and erected 350 . 00 



Heater, one piece cast iron with oil separator 155.00 



Pumps 140.00 



Piping and erection of pumps and heater 250 . 00 



Engine, 14x 36, 100 r.p.m 1,600.00 



Freight and hauling 100 . 00 



Foundation for engine 400 . 00 



Belts and shafting 400 . 00 



Dynamo and wiring for same 675.00 



Total cost of plant $7 , 430 00 



Operating cost — 



Coal, 120 tons per month, 10 months, $1.55 per ton . $1 , 860 . 00 

 Labor, engineer $15 per week, fireman $10 per week . 1 , 000 . 00 



Waste and supplies 200 . 00 



Repairs 100 . 00 



Total $3 , 160 . 00 



Fixed charges — 



Interest at 5 per cent $371 . 50 



Depreciation at 8 per cent 594 . 40 



Insurance at 1 per cent 74 . 30 



Taxes at 1 per cent 74 . 30 



Total $1,114.50 



Yearly cost of power $4 , 274 . 50 



Figuring on three-fourths load as 130 horse-power for 10 hours 

 per day and on 200 days per year, the cost per horse-power per 

 I hour would be 1.65 cents. This would be equivalent to a cost 

 of 2.21 cents per kilowatt hour. This figure is low, since^ there 

 are few mills that could figure on a load factor as high as three- 

 fourths load. In most cases it would not in all probal^ility go 

 over 50 per cent, and in such cases the costs would be 2.44 cents 

 per horse-power, or 3.27 per kilowatt per hour. 



In connection with the cost of power in small units other 



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