NASA NTRS · 19790000576
Microscope for high-temperature welding
Abstract
Dark glass in eyepieces lets welder look at fine parts without eye damage. Previously welder had to repair barely visible crack without magnification, because necessary goggles kept eyes too far from microscope eyepieces.
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Accountius, O. E.. 1980-06-01. Microscope for high-temperature welding. https://ntrs.nasa.gov/citations/19790000576
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