Image:BmEd.jpg

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[edit] Summary

An Ordnance Survey cut benchmark in Edinburgh, Scotland. © 2004, Jeremy Atherton

The term benchmark originates from chiseled horizontal marks, like this one, that surveyors made into which an angle-iron could be placed to bracket (bench) a levelling rod, thus ensuring that the levelling rod can be accurately repositioned in the same place in the future. These marks were usually highlighted with a chiseled arrow below the horizontal line.

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Date/TimeDimensionsUserComment
current05:11, 3 January 2006600×600 (128 KB)JeremyA (An w:Ordnance Survey benchmark in w:Edinburgh, w:Scotland. © 2004, Jeremy Atherton)
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