Then as the slight excess of fluid in the immediate vicinity of the hole drains, and an equilibrium is established, the output gradually shrinks to the level of the old wells in the pool. The wells at Triumph are from 600 to 800 feet deep, and usually...
Report of Progress ... - Σελίδα 13
των Pennsylvania. Geological Survey, 2d, Pennsylvania. Board of Commissioners for the Second Geological Survey - 1800
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