. The mastery of water. s used at first, and, when this becomestoo heavy to rotate, a narrower one is lowered inside it,and then a narrower one still. When the water-bearinglayers of rock are reached, the water often rises in afountain, many feet high, and delivers hundreds ofgallons of water per minute. In order to give some idea of the importance of artesianwells we may consider the colony of Queensland, inwhich there were 1,879 wells in the year 1912. The depthvaries from ten feet to 5,045 feet, the average being 1,081feet. The Charleville bore is 1,371 feet deep and producesthree million g
. The mastery of water. s used at first, and, when this becomestoo heavy to rotate, a narrower one is lowered inside it,and then a narrower one still. When the water-bearinglayers of rock are reached, the water often rises in afountain, many feet high, and delivers hundreds ofgallons of water per minute. In order to give some idea of the importance of artesianwells we may consider the colony of Queensland, inwhich there were 1,879 wells in the year 1912. The depthvaries from ten feet to 5,045 feet, the average being 1,081feet. The Charleville bore is 1,371 feet deep and producesthree million gallons a day. The water issues at a pressureof seventy-nine pounds on the square inch, and shoots upin a magnificent fountain, 100 feet in height. The totaldepth of the Queensland wells is 384-68 miles, and thetotal yield is 529,817,860 gallons per day. There are many artesian wells in England, but theyare generally most necessary in flat countries, wheresprings are rare, and the surface streams dry up in thehot By permission of the Q;,,.:,h-td Govemmmi. AN ARTESIAN WELL. The Charleville Bore, Queensland. 24 THE MASTERY OF WATER. CHAPTER V. Pumps and How They Work. If you were asked how long man has known how topump water from one level to another, what would yousay ? Before the steam engine, certainly, for we know
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