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The characteristics of the motion of solid body markers over a settled composite vortex surface were studied using a laboratory apparatus. The vortex was generated in a cylindrical container filled with water using a rotating disc on the container bottom. The paths of solid body markers were visualized. The radial distribution of the angular velocity of marker revolution around the container center was obtained. A rela tionship between eigenrotation frequencies and rotation around the container center occurred for two types of polypropylene markers (a flat square plate and a voluminous small tube).

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