FIELD: telescopic engineering. SUBSTANCE: device has the base provided with three ball supports uniformly arranged over periphery. The supports are rigidly secured to slides mounted for permitting movement in guides rigidly secured to the base. The axes of the guides intersect at one point which is located at the axis of the mirror and arranged in one plane perpendicular to the mirror axis. The centers of spherical heads of the ball supports are arranged in the plane which passes through the center of mass of the mirror and is perpendicular to the mirror axis. The centers of the spherical heads of the ball supports are arranged over periphery whose radius is equal to 2/3 of the mirror radius. EFFECT: enhanced reliability. 2 cl, 3 dwg
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