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> Brunson k&e 71-2410 optical square for alignment scope
Brunson k&e 71-2410 optical square for alignment scope
According to the Manufacturer's catalog:
The Optical Square is mounted on an alignment telescope or an alignment collimator with an outside diameter of 2.2498 in. (conforming to A.I.A. specification). It establishes a plane perpendicular to the basic line of sight at right angles to it, with an accuracy of within one second of 90 degrees. No adjustments are needed to set the right angle. The basic line of sight can be checked while the optical square is attached to the telescope, since the square has both a front and a side aperture. The optical system is mounted in a spherical housing of 3.500 in. diam. with the vertex of the right angle at the center of the sphere.
Unit is missing the protective caps.
