TrigpointingUK

Thank you for your help, that has been most useful. Not sure if it has satisfied my curiosity or encouraged me to delve even deeper

Thanks for the replies.
Interesting comment there agentmancuso regarding the pillars on the maps.
My question though is about the difference between trigonometrical point and the triangulation stations. I have been looking at old maps (mid 1800's) and see that these points mark a height and are ...

I hope that there is an expert out there who can answer this question.
I have been looking at an old 1 inch to the mile OS map dating back to 1948. The map features small triangles with a dot and next to each is a height in feet. These are not always at the highest point of a hill. There are called ...

Hi Peregrinus,
Thank you for the information, I have requested to join the group.
Regards,
Rocky

Hi All,
Newbie here, just registered onto the site after finding it a while ago.
Here's a question which after a search around the site I could not find an answer too:
Is there such a thing as an official list of the date of construction of pillars or the placement of bolts etc?
Thanks,
Rocky