Figures are produced in a sheet metal structure in the form of a body of revolution. The angle between incident and diffracted to the receiver ray depends on the specimen material and the radiation wavelength specimen rotates about an axis perpendicular to the plane of symmetry between incident and reflected ray, and also about an axis in the above planeaxis is also the specimen axis of symmetry. The specimen (11) has a conical surface (12) and rotates about the axis (16) perpendicular to the above plane of symmetry, and about the cone axis (13).
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