NASA NTRS · 19760000246
Radial level
Abstract
Actual angle indicator is a liquid captured inside cylindrical transparent tube that is radially mounted around or under 360 deg scale. Device is functional and accurate within full 360 deg spectrum and instantly determines any surface angle without making adjustments since it has no moving parts.
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Posey, D. L.. 1976-08-01. Radial level. https://ntrs.nasa.gov/citations/19760000246
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