Trig Points and Benchmarks, Beginning

I’ve just discovered another version of trainspotting (I refer you to my obsession with post boxes in reference). This one is about Ordance Survey levelling and triangulation marks. I see this as a source of entertainment that can last the rest of my life, so you have been warned that there are better ways to spend your time.

So, I have a database of Triangulation Points (TrigPoints) which, as is one of the vagaries of this obsession, can be Intersectional — and therefore may not include a brass or similar marker — or can entail a poured concrete pillar or a rivet or a wee plaque or some combination. Simpler items in my database, which ceased to be used even by the OS some decades back, include cut bench marks meant for surveyors to have some standard elevation to refer to. it is a fantastic system.

I got out for a start on chasing these bits of historical/architectural furniture (there’s a new map) and intend to chase it further than the canal furniture thing.

This episode includes the Old Joe tower most of my readers will know from Lord of the Rings which is also a registered TrigPoint; and, a cut benchmark (Cut Mark or CM, for short) on a building downtown that sits across from Constitutional Hill from the Hen and Chickens.