We apply Torricelli's Law to the task of building a water clock in which the height of the water in a container falls at a constant rate when the container has a hole in the bottom to let the water flow out. First, we review the principles and derivation of the applicable physics in Torricelli's Law. Second, we determine the shape of the container, given a constant spigot size for the exit hole, so that the water height falls at a constant rate.
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