NASA NTRS · 19630000003
Setting of angles on machine tools speeded by magnetic protractor
Abstract
An adjustable protractor facilitates transference of angles to remote machine tools. It has a magnetic base incorporating a beam which can be adjusted until its shadow coincides with an image on the screen of a projector.
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Vale, L. B.. 1964-05-01. Setting of angles on machine tools speeded by magnetic protractor. https://ntrs.nasa.gov/citations/19630000003
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