Water Level

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“a, a, a, represents the water-level of a pond or reservoir upon elevated ground. From this pond a line or pipe is laid, passing over a bridge or viaduct at d, and under a river at c. The fountains, at b, b, show the stream rising to its level in the pond, a, at two points of very different elevation.” — Wells, 1857


David A. Wells The Science of Common Things; A Familiar Explanation of the First Principles of Physical Science50


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