File:2020-12-01 16.28.00.jpg

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A sagitta rule for directly measuring the radius of 10 foot sections of rail. Photo by Daris A Nevil, December 2020.

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current21:33, 1 December 2020Thumbnail for version as of 21:33, 1 December 20203,024 × 4,032 (2.76 MB)Dnevil (talk | contribs)A sagitta rule for directly measuring the radius of 10 foot sections of rail. Photo by Daris A Nevil, December 2020.

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