Column |
Meaning |
Source |
Name |
The best Guess at the Official Name |
Various |
TLA |
Acronym mainly used in the transcription of the Second
Geodetic Levelling |
Manually |
Grid Ref |
Most Accurate Location for the Mark |
GR Source |
How this GR was obtained |
Fayers Visit |
When it was Bagged by Mike of
Fayers Fame |
Fayers |
Fayers (R) |
(R) if the FBM is known to be surrounded by (Green)
railings |
T:UK |
Waypoint and Link to Mark on
TrigPointingUK.com |
T:UK |
T:UK Visit |
When last visited by a member of T:UK |
OSRef |
the OS
GPS Station Number, P and D are links direct to the Photo and
Diagram Bold if the Station has been reused as a Passive Station. |
OS
GPS |
OS GridRef |
the GR as listed on the OS site |
OS Last Ref |
when the OS records it last visited the site |
Last Visit |
Latest Date of Visit (from Fayers, T:UK and OS) |
1GL |
Which Levelling Series the Mark was used
in.
Value |
Meaning |
Source |
Pri |
Used as a End point for a Primary Line |
2GL - From the Abstract Index 3GL - Manually
from Large Scale Diagram |
FBM |
Used in Newlyn circuit
(and Wasdale was never levelled to!) |
TG |
Connected to Primary Network via Secondry Lines |
Sec |
Only used in Secondary Lines |
Manually from Diagrams |
|
2GL |
3GL |
POL |
the Proudman Oceanographic Laboratory reference for the Tide
Gauge |
POL |
Type of Mark |
What type it is |
manually |
Nearest FBM/Aux |
the nearest other Mark |
manually |
2GL Height (ft ODN) |
height as obtained in the Second Geodetic Levelling |
ODN: Orthometric Datum
Newlyn |
2GL
Report |
OS Height (m ODN) |
height as obtained from the
OS GPS site |
OS GPS |
Type of FBM |
Bolt |
Original (?) embossed, domed 'datum bolt' with either a
height plate, or the fixings for one, and an OS 'Bench Mark' plaque on one side
of the pillar |
Rivet |
Replacement (?) domed 'rivet' engraved with 'OSBM' |
|
manually from photos |
2GL 1:2500 Plan |
Which county series map the FBM appears on |
2GL
Report |