Thesaurus Term/Concept: FUNDAMENTAL BENCH MARK
Identifier | 160452 |
---|---|
Class | MONUMENT TYPE |
Status | Preferred |
Index? | Yes |
Scope Note | Used by Ordnance Survey to record high accuracy height above Ordnance Datum Newlyn. Marked by a low concrete pillar, and maybe surrounded by railings, they comprise an underground chamber protecting the reference point, built directly onto stable bedrock. |