COST OF POWER I4I 



3. For intermittent service — no expense when not in oper- 

 ation. 



4. No water is used except for the cooling tank, and this 

 water may be used over and over again. 



5. It is safe and easy to handle, and no danger from fire. 

 As disadvantages might be considered: 



1. Subject to great wear and tear. 



2. The original cost of a gasoline engine is greater than that 

 of a steam engine. 



3. The strong odor from the exhaust. However, this may be 

 fairly well conducted from the building; nevertheless it is most 

 satisfactory that the gasoline engine is placed in a separate 

 room which can be thoroughly ventilated. 



Cost of Operation. — A gasoline engine will consume about 

 one tenth of a gallon of gasoline per horse power per hour. If 

 the cost of gasoline is 24 cents per gallon then the cost per 

 horse-power hour is 2.4 cents. 



KEROSENE FOR POWER 



The kerosene engine may be operated either with kerosene 

 or gasoline. As advantages and disadvantages for this machine 

 the same might be mentioned as enumerated under the head of 

 gasoline engines. The odors from the kerosene engine are 

 somewhat stronger, the original cost about 25 per cent higher, 

 but the cost of operation with kerosene is much less. 



Cost of Operation. — About one eighth of a gallon of kero- 

 sene is required for producing one horse-power hour. If the 

 cost of kerosene is 12 cents per gallon then the cost per horse- 

 power is 1.5 cent. 



ELECTRIC POWER 



Electric power is measured in kilowatts (K. W.). A watt is 

 1/746 of a horse power and a kilowatt is 1,000 watts or i 1/3 

 horse power. A small amount of power is lost due to friction 

 in the bearings and to heating of wires, therefore a motor re- 

 ceiving a kilowatt power will transmit slightly less than that 

 amount. 



