File:2020-12-03 10.42.26.jpg: Revision history

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3 December 2020

  • curprev 17:1017:10, 3 December 2020Dnevil talk contribs 234 bytes +234 Using a Sagitta Rule, Step 1: Place the ends of the rail against a wall or other straight edge. Place the Sagitta Rule at the midpoint of the rail, where the distance from the wall is greatest. Photo by Daris A Nevil, December 2020.