NASA NTRS · 19660000642
Three-axis attitude and direction reference instrument has only one moving part
Abstract
Lunar vehicle instrument combines the functions of attitude reference, direction reference, and display in a unit having only one moving part. The device, using bubble levels and a calibrated dial, is used as a sextant prior to takeoff, and as a backup navigation system during flight.
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Bossler, F. B.. 1966-12-01. Three-axis attitude and direction reference instrument has only one moving part. https://ntrs.nasa.gov/citations/19660000642
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