| 摘要 |
PROBLEM TO BE SOLVED: To provide a water-film screen forming nozzle by which an almost semicircular water-film screen capable of projecting an image without reducing the image even in the inside if a house where the distance of spouting water is limited. SOLUTION: The front end of a cylinder 3 is closed by a backplate, the upper-half peripheral wall above the horizontal plane 5 passing through the center 0 of the cylinder 3 is notched close to the backplate to form an opening 6, and the cross-sectional area of flow facing the opening of the downstream nozzle part in the cylinder 3 is formed by a V-sectional small-area part 3X below the horizontal plane 5 and a semicircular-sectioned large-area part 3×1 above the horizontal plane 5.
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