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. 2003 Apr 1;108(2):135–145. doi: 10.6028/jres.108.013

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 3 — Roundness Traces of PG-39. Deviations from circles were measured at elevations (3.0, 18.75, 37.4, 56.25, and 72.0) mm from the bottom. Roundness data were coupled with absolute diameters and the straightness data to construct the traces in this figure, which are referenced to an absolute scale.