File:Benchmark in Edinburgh.jpg
Benchmark_in_Edinburgh.jpg (600 × 600 pixels, file size: 128 KB, MIME type: image/jpeg)
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Summary[edit]
DescriptionBenchmark in Edinburgh.jpg |
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. |
Date | 3 January 2006 (original upload date) |
Source | No machine-readable source provided. Own work assumed (based on copyright claims). |
Author | No machine-readable author provided. JeremyA assumed (based on copyright claims). |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 05:11, 3 January 2006 | 600 × 600 (128 KB) | JeremyA (talk | contribs) | An w:Ordnance Survey benchmark in w:Edinburgh, w:Scotland. © 2004, Jeremy Atherton |
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