Power

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The water-jet, as already explained, works in connection with curved vanes, operating them by giving up its velocity, an action which distinguishes FIG 1? them from the old and most common overshot wheels, where the water turns the wheel by its weight alone. It is worth while to review the principles of these turbines, which had the effect of changing water-power development methods, and which 232 POWER were not built in this country until 1844. In Fig. 177 is shown a crude Indian affair, actin...g by impulse. Water issuing from the wooden pipe has a certain velocity and direction, and by impulse on the wooden vanes turns the wheel. A more recent form and better design, though still an old one, is shown in Fig. 178, in which gates are provided to control the water. The spout is tapered to get a better form of jet and the vanes are curved to get better effect on the wheels. Elevation. FIG. 178 Plan and Partial Section. FIG. 179 This design is fundamental to the modern impulse wheel. A similar simple wheel of earlier times, con- taining the essentials of the modern reaction wheel, is shown in Fig.

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