Page:Lowell Hydraulic Experiments, 4th edition.djvu/63

 sequence of a concavity in the path, that centrifugal force can have any existence. With the gate only partially raised, this force may act powerfully in increasing the discharge, and a similar effect may be produced, at high velocities, with the gate fully raised; but in experiment 30, giving the maximum coefficient of effect, it can have had only a slight action.