Happy birthday to the trig pillar, 80 years old today 18 April 2016 gsvalentineblog 1 Comment Ordnance Survey (OS) is celebrating the 80th anniversary of the triangulation pillar. Share this:Click to share on Bluesky (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on X (Opens in new window)Like this:Like Loading... Related
Ok I give up , what was it for ?