Abstract: A method of measuring the direction of mechanical vibrations, in which a plurality of points are marked on the surface of a vibrating object along the arc of a circle of a given radius at a constant pitch selected from a range of 1.2 to 1.8 of the amplitude of mechanical vibrations, forming a circular scale and while moving together with the vibrating object making up, depending on the shape of a trajectory of mechanical vibrations, stroboscopically still equal segments of a straight line or patterns. A group of straight line adjacent segments disposed at a minimum distance in a radial direction or patterns having a maximum overlapping and a radially arranged axis of symmetry is visually defined. An ordinal number is determined of one or two straight line segments or of one or two patterns through which the axis of symmetry passes, and the direction of mechanical vibrations is measured on the circular scale by an angle corresponding to this ordinal number.

Abstract: A method for measuring the amplitude of mechanical vibrations comprises the application of a measuring sign in the form of a measuring circle to the surface of the vibrating object, the radius of said measuring circle being of any length selected out of the range of measured values. Each measuring sign vibrating jointly with the object forms a figure of its own and the vibration amplitude of the object is measured along the radius of that particular measuring circle whose visually percepted parts are in contact in the center of the figure formed by said circle.

Abstract: Polymerization or copolymerization of the starting monomers is carried out in a hydrocarbon medium in the presence of a catalyst containing an alkylaluminium chloride compound, a trialkylvanadate and an alkoxyderivative of titanium, or zirconium, or hafnium. The method of the present invention makes it possible to considerably increase the polymerization rate and degree of conversion in the preparation of polymers and copolymers of higher .alpha.-olefines. The resulting polymers of higher .alpha.-olefines have a stereoregular structure with a high degree of crystallinity which is manifested in an increased melting point of the resulting polymer.