Abstract
A THIN transparent sheet of cellulose acetate, bearing on one face an accurate mould of the low relief produced in a relatively flat metal surface by abrasion, etching or impact, constitutes a useful permanent record of this relief for comparative purposes. It is superior to a photograph in being three-dimensional, but serves as a negative for photographic copies, if necessary.
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DOLLAR, A. Recording Low Relief in Metallic Surfaces by Cellulose Acetate Moulds. Nature 152, 248 (1943). https://doi.org/10.1038/152248a0
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DOI: https://doi.org/10.1038/152248a0
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