2010
ST4928 : Bench Mark, Church of St Michael and All Angels
taken 14 years ago, near to Somerton, Somerset, England
Bench Mark, Church of St Michael and All Angels
The bench mark is to found on the west side of the tower. For a photograph of the church
ST4928 : Church of St Michael and All Angels, Somerton and for 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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