SD5235 : Bench Mark, Preston 4

taken 11 years ago, near to Broughton, Lancashire, Great Britain

Bench Mark, Preston 4
Bench Mark, Preston 4
Pivot bench mark on the top of milestone. For wider views see SD5235 : Milestone, Broughton and SD5235 : Milestone, Broughton and LinkExternal link
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.
Thanks goes to fellow Geograph member Roger Templeman with whose help I am beginning to learn the finer points of Ordnance Survey bench marks.
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SD5235, 27 images   (more nearby search)
Photographer
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Date Taken
Monday, 22 March, 2010   (more nearby)
Submitted
Tuesday, 6 April, 2010
Category
Bench Mark   (more nearby)
Subject Location
OSGB36: geotagged! SD 523 353 [100m precision]
WGS84: 53:48.7341N 2:43.5542W
Camera Location
OSGB36: geotagged! SD 523 353
View Direction
North-northwest (about 337 degrees)
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