. Geology and underground water resources of northern Louisiana . ^:zni^^^,ji^ L^/^-^ -^^ From U. S. Geol. Surv. Jetting Process. veatch] Underground Water of Northern La. 105 The constant rotation and the high water pressure used enablesthe rotary to be employed in a manner entirely different from anyother outfit and makes the process peculiarly fitted for penetratingvery caving, unconsolidated materials. In such instances thecasing, armed with a toothed cutting shoe (PI. l, 4), is itselfused for the wash pipe and the water and drillings returned tothe surface between it and the wall of the h
. Geology and underground water resources of northern Louisiana . ^:zni^^^,ji^ L^/^-^ -^^ From U. S. Geol. Surv. Jetting Process. veatch] Underground Water of Northern La. 105 The constant rotation and the high water pressure used enablesthe rotary to be employed in a manner entirely different from anyother outfit and makes the process peculiarly fitted for penetratingvery caving, unconsolidated materials. In such instances thecasing, armed with a toothed cutting shoe (PI. l, 4), is itselfused for the wash pipe and the water and drillings returned tothe surface between it and the wall of the hole. In practice thewash water is mixed with fine clay, and this very muddy watertends to plaster up any sand beds encountered and so prevent anyloss of water and consequent reduction of head. Constant motionand water pressure are required, and in order to facilitate theaddition of drilling pipe two water swivels are employed. Whenthe hole has been drilled to such a depth that the top of the pipeis near the revolving table a length of pipe is attached to thesec
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