OS benchmark and bolt on the Shire Hall
Introduction
The photograph on this page of OS benchmark and bolt on the Shire Hall by Richard Law 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: © Richard Law Taken: 4 Nov 2020
A couple of geographers have photographed this 1st Primary Levelling bolt before Image and Image, which was installed in late 1843 or early 1844. At the time it was recorded at 256.359ft above Liverpool datum.
