2010
ST4928 : Bench Mark, Market Place, Somerton
taken 14 years ago, near to Somerton, Somerset, England
Bench Mark, Market Place, Somerton
The bench mark is to be found on the former town magistrates court. For a photograph of the building
ST4928 : The Courthouse Gallery, Somerton and for more information about the bench mark
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A bench mark is an Ordnance Survey arrowhead sign found on walls, bridges, churches and specially erected triangulation pillars where the altitude above sea-level has been accurately measured by surveyors. The arrowhead points to a horizontal line above it which marks the exact altitude.
With rivets and pivots there is no datum (horizontal line) cut, the pointed-to horizontal surface defining the datum height.
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