NASA NTRS · 19650000066
Sensitive level sensor made with spirit level, gives electrical output
Abstract
Sensor incorporating a circular spirit level, electrical lamp and two pairs of photocells, provides an electrical indication of flat surface level deviation.
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Bryant, E. L.. 1965-03-01. Sensitive level sensor made with spirit level, gives electrical output. https://ntrs.nasa.gov/citations/19650000066
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