| 摘要 |
A pump comprises a vertical pumping tube fitted with a check valve supported against gravity and held in tension by extension springs; a lower spring stretched between the pumping tube and a dead weight; an upper spring stretched between the pumping tube and a rigid frame; a scotch yoke, escapement, or other device that imparts motion to the pumping tube to cause filling, lifting, and draining of the pumping tube so as to pump water or other fluids from a well or body of water.
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