WINDMILLS AND PUMPS. 267 



gallons of water will be secured, practically filling the 

 300,000 gallon reservoir. Daring the six months from 

 April to September inclusive, there are nine periods of 

 t \\vnty days each. Therefore, the reservoir can be 

 emptied and re-filled nine times during the six months, 

 resulting in an aggregate of 2,700,000 gallons of water 

 for irrigation purposes, equal to 360,000 cubic feet. 

 This is sufficient water supply to irrigate ten or eleven 

 acres of ordinary soil nine times during the season, 

 which would be the maximum number of wettings. A 

 steam-pumping plant with a fifty horse-power engine 

 will raise 7,500,000 gallons of water to a bight of ten 

 feet every ten hours. This amount of water will cover 

 twenty-three acres to the depth of a foot in the period 

 mentioned. The cost of the plant will approximate 

 $3000. It will require one man to operate it, and about 

 one ton of coal daily to keep it in operation. In many 

 places wood is so abundant and cheap that coal is not 

 needed to be used, while in numerous localities straw or 

 cobs may be burned, thereby reducing the cost of fuel 

 to a minimum. A four-inch centrifugal pump, with a 

 gasoline engine of two and one-half net horse power, will 

 raise 9000 gallons of water an hour twenty-five feet ver- 

 tically, and it can be operated twenty-four hours a day, 

 or less, as desired. 



