Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 86
Fig. 94. 268. Springs. As water falls upon the surface of hillsand mountains, it trickles through the surface soil until itreaches a stratum of earth that it cannot enter. It thenflows along this impermeable stratum, constantly descend-ing. If the stratum comesto the surface at any point,as the… … mm Fig. 95. 269. A Well is simply an opening made to such an underground current of water.The water then flows in, filling the well to a point as nearthe surface as the pressure of the water will raise it. 270. Artesian Well. If the water enter a porous stratumsituated between two impervious…
Physics
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