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Mystery Object ... This one has me beat

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Bo'sun	14/09/2020 18:49:06
754 forum posts 2 photos	Hi, an OS triangulation point would have had three equispaced groves (presumably brass or bronze) for the theodolite tripod feet to locate in, and sometimes an anchor point in the centre to secure it down.
Nicholas Farr	14/09/2020 20:15:38
3988 forum posts 1799 photos	Hi Bo'sun, the one in my photo isn't a triangulation point. There were a few of these on the land surrounding a exhausted quarry and were used to make regular checks on any subsidence that may have occurred over a number of years. Regards Nick. Edited By Nicholas Farr on 14/09/2020 20:17:00
Sam Longley 1	14/09/2020 21:33:58
965 forum posts 34 photos	Posted by Neil Wyatt on 12/09/2020 13:01:21: Posted by John McNamara on 12/09/2020 07:32:31: Yes I know this is a segway... assuming the part is a survey mark It's Been a while since I posted on this forum. The past couple of years have been very hectic. Next Wednesday we pick up the keys to a new house. After 38 years in one house we are moving to the hills about a 45 minute drive from Melbourne. I wish to build a new shed and in order to do so the council requires survey, I was on site when this was done in order to discuss the location. And yes the EPOXY CNC mill post on this forum will continue when the shed to house it is built. A Land survey starts not at your property but at the known reference points in the area. One of those points was in a council field nearby, about a foot below the grass! Using the very accurate GPS station that surveyors use he had no problem locating it. The surveyor told me that there are many of these hidden reference marks around the city. The importance of the mark determines how it is founded, the more important ones may sit on hidden but massive concrete foundations. In older parts of the UK we often have benchmarks, typically what looks like a 'WD' arrow but usually with a horizontal line above. 55 years since I did surveying at college, but did not these marks all relate back to a point in Newlyn in Cornwall? Or is that no longer the case?
Neil Wyatt	14/09/2020 22:07:24
19226 forum posts 749 photos 86 articles	Posted by Sam Longley 1 on 14/09/2020 21:33:58: Posted by Neil Wyatt on 12/09/2020 13:01:21: Posted by John McNamara on 12/09/2020 07:32:31: Yes I know this is a segway... assuming the part is a survey mark It's Been a while since I posted on this forum. The past couple of years have been very hectic. Next Wednesday we pick up the keys to a new house. After 38 years in one house we are moving to the hills about a 45 minute drive from Melbourne. I wish to build a new shed and in order to do so the council requires survey, I was on site when this was done in order to discuss the location. And yes the EPOXY CNC mill post on this forum will continue when the shed to house it is built. A Land survey starts not at your property but at the known reference points in the area. One of those points was in a council field nearby, about a foot below the grass! Using the very accurate GPS station that surveyors use he had no problem locating it. The surveyor told me that there are many of these hidden reference marks around the city. The importance of the mark determines how it is founded, the more important ones may sit on hidden but massive concrete foundations. In older parts of the UK we often have benchmarks, typically what looks like a 'WD' arrow but usually with a horizontal line above. 55 years since I did surveying at college, but did not these marks all relate back to a point in Newlyn in Cornwall? Or is that no longer the case? Yes, that's the case.
Martin King 2	14/09/2020 22:44:23
1129 forum posts 1 photos	Newlyn is also the base reference for tide charts Martin

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