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 Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on WhatsApp (Opens in new window)Like this:Like Loading... Related
Ok I give up , what was it for ?