1965-02-01

THREE WAY VISION VIA 3 D SQUARE 650757

A recently developed three directional (3 D) optical square establishes three mutually perpendicular lines-of-sight in one instrument setting. Since no realignment or rotation is required once it is aligned to a target, a substantial savings in time and cost is realized in tool erection and routine checking. The instrument and its application at The Boeing Company is discussed in this paper.

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