NASA NTRS · 19680000128
Photographic and drafting techniques simplify method of producing engineering drawings
Abstract
Combination of photographic and drafting techniques has been developed to simplify the preparation of three dimensional and dimetric engineering drawings. Conventional photographs can be converted to line drawings by making copy negatives on high contrast film.
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Provisor, H.. 1968-04-01. Photographic and drafting techniques simplify method of producing engineering drawings. https://ntrs.nasa.gov/citations/19680000128
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