Unidentified mark

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Unidentified mark

Postby Belliott56 » Mon Oct 23, 2017 11:34 pm

My house has this mark on it. Can anybody tell me if it is, or ever has been, of any significance.
The file information of the picture gives its location as Lat. 53.25.33.95 Long. 2.10.16.72
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Re: Unidentified mark

Postby agentmancuso » Tue Oct 24, 2017 6:43 pm

That's an Ordnance Survey benchmark. I'm struggling to decode the given coords though; could you tell me a bit more about the location i.e. address or town at least?
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Re: Unidentified mark

Postby ted » Wed Oct 25, 2017 1:09 pm

Lat. 53.25.33.95 Long. 2.10.16.72


Pasting N 53 25 33.95 W 2 10 16.72 into Google Maps indicates Stockport, near the
junction of Manchester Road (A626) and Halesden Road. Is that correct?

https://www.ordnancesurvey.co.uk/gps/transformation/ can be used to
convert this to an OS grid reference 388713.73 392156.881

and then http://www.bench-marks.org.uk/ can be used to search for benchmarks
in the vicinity of SJ 88713 92156
But it reports the nearest to be nearly 300 metres away :(

Not sure if the database doesn't include all OS marks, or if this particular mark is non-OS.
Or maybe my sums are wrong :)


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Re: Unidentified mark

Postby agentmancuso » Wed Oct 25, 2017 8:51 pm

The BM database definitely doesn't contain all Ordnance Survey benchmarks, but as a general rule those missing are older marks. This one looks like a NBM judging by the brickwork. I tried that SJ8892 and one other SJ square from another translation, but nothing obviously close there either.
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Re: Unidentified mark

Postby Belliott56 » Thu Oct 26, 2017 3:30 pm

We're talking about the right place.
Apparently when some civil works were going on nearby 5 or 6 years ago, a chap in a hi-viz top and a safety helmet carrying a theodolite asked my wife if he could look at the mark. Before that we had no knowledge of it being there, seemingly this chap did, so I guess it must be on record somewhere?
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Re: Unidentified mark

Postby agentmancuso » Thu Oct 26, 2017 7:10 pm

Here you go:B45789
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Re: Unidentified mark

Postby Belliott56 » Fri Oct 27, 2017 8:44 pm

Wahey Thank you. It's probably staring me in the face on the link you posted but is there any way of establishing when the mark was made?
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Re: Unidentified mark

Postby agentmancuso » Fri Oct 27, 2017 8:51 pm

It's not on that page, but on the OS source page, enter SJ8892 in the search box: 1959
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