Abstract
Precision optical alignment and/or measurement more often than not requires coordinate systems which for convenience of analysis are not based on a gravity reference system. Conventional jig transits, telescopic transit squares and optical transit squares which rely on a gravity reference system require that measurements be taken from. plumb lines (vertical planes) and level lines (horizontal planes). If the object being analyzed is not oriented coincident to the earth's xis, then data oust be mathematically reduced by use of trigonometry and geometry formulae which mu be time consuming as well as introduce additional potential errors in analysis. A state-of-the-art optical instrument has been developed which virtually defies gravity and allows rapid. setting of orthogonal pl.H.nes without a gravity reference.
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