Abstract

A reference angle is described that forms, by successive or multiple reflections, a multiplicity of equal optical angles having common vertices. This angle may be used as a standard for calibrating circular scales either with an autocollimator or an interferometer. The angle can be adjusted in an interferometer to a very high accuracy. If the faces of the mirrors are 6 in. long, an error of 0.1 fringe corresponds to an error in the angle of 0.02 sec of arc.

© 1961 Optical Society of America

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References

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