File:Benchmark in Edinburgh.jpg

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

Summary

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.
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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Captions

Typical Benchmark chiseled on Rock

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Date/TimeThumbnailDimensionsUserComment
current05:11, 3 January 2006Thumbnail for version as of 05:11, 3 January 2006600 × 600 (128 KB)JeremyAAn w:Ordnance Survey benchmark in w:Edinburgh, w:Scotland. © 2004, Jeremy Atherton
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