NASA NTRS · 19680000322
Modified sine bar device measures small angles with high accuracy
Abstract
Modified sine bar device measures small angles with enough accuracy to calibrate precision optical autocollimators. The sine bar is a massive bar of steel supported by two cylindrical rods at one end and one at the other.
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Thekaekara, M.. 1968-08-01. Modified sine bar device measures small angles with high accuracy. https://ntrs.nasa.gov/citations/19680000322
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