Ordnance Survey triangulation bolt
Introduction
The photograph on this page of Ordnance Survey triangulation bolt by Mat Tuck as part of the Geograph project.
The Geograph project started in 2005 with the aim of publishing, organising and preserving representative images for every square kilometre of Great Britain, Ireland and the Isle of Man.
There are currently over 7.5m images from over 14,400 individuals and you can help contribute to the project by visiting https://www.geograph.org.uk

Image: © Mat Tuck Taken: 3 Nov 2013
Large surface bolt set in to a concrete block by the former railway bridge on Crow Arch Lane.
