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Image: Benchmark in Edinburgh

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Benchmark_in_Edinburgh.jpg ‎(600 × 600 pixels, file size: 128 KB, MIME type: image/jpeg)

Description: 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.
Author: No machine-readable author provided. JeremyA assumed (based on copyright claims).
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
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