NASA NTRS · 19660000061
Instrument quickly transposes ground reference target to eye level
Abstract
Optical alignment of equipment is facilitated by a traverse target with a string suspending a plumb bob to transpose the ground level point to eye level operation. This instrument appreciably decreases the time required from the present method but achieves the same degree of precision.
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Green, B. E., Van Deventer, E. L.. 1966-02-01. Instrument quickly transposes ground reference target to eye level. https://ntrs.nasa.gov/citations/19660000061
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