Abstract
The efforts tending toward the improvement of internal navigation and the utilization of water-power, in Germany, England and the United States, and especially in Switzerland, have offered many opportunities in recent years for the application of the Stoney type of roller sluice-gate. Although such gates for individual openings in movable dams up to 80, 90 and even 100 ft. in width, for smaller heights, and of nearly 30 ft. in height, for smaller widths, were used successfully and are operated easily by counterbalance weights, and are proposed to be constructed of still larger dimensions in Europe as well as in the United States, a desire has frequently been felt for a device permitting the closing and opening of gaps of considerably larger proportions by means of one single body, in the shortest time possible, without requiring intermediate supports or trestle bents.
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