SD984429

[SJW1960]

My copy of the South Pennines OL 21 map (2002 edition) clearly shows a trig-pillar at grid SD984429 (adjacent 'Wainman's Pinnacle'). However, during a brief visit, I was unable to find it 'on the ground' and no-one here seems to have logged it previously. Is this a cartographic error or am I missing something?

[ted]

Hi,

Wainmans Pinnacle *is* the trig station; http://trigpointing.uk/trig/9038
- its recorded in TPUK as an Intersected Station; a few more details on these pages:
http://trigpointing.uk/wiki/Intersected_Station
https://www.ordnancesurvey.co.uk/gps/pages/triangulation-mark-trig-number-help

So in this instance, the triangulation symbol on your map does not indicate that there
was ever a pillar at this location. It dates from a time when the OS would mark other
kinds of trig station with this symbol. But its unclear why it wasn't removed from later
editions of the map; maybe an oversight. Stoodley Pike is another example in the same area.


Regards
Ted

[SJW1960]

Thanks Ted.

[agentmancuso]

... maybe an oversight...

Yes, undoubtedly an oversight. For a while pillar stations were marked in cyan but non-pillar stations like the one above were marked in black. When the OS decided to remove non-pillar stations, the process seems to have been manual, as quite a few were missed. Later, all remaining stations, pillar or otherwise, were printed in cyan, obscuring the difference.