from The Century Dictionary.
- noun A system of pumping the water from deep mines, in which the lift from the bottom is divided into steps or stages, so that the water is raised by a series of pumps from level to level, instead of being forced to the surface in one operation. The stress on the pipe which discharges the water is less than if the head on one pump only were the depth of the shaft, and each pump is lighter than if the total head had to be overcome at once.
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