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Author Topic: OS Trig Points and Bench Marks in Kent  (Read 35798 times)

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Offline smiffy

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Re: OS Trig Points and Bench Marks in Kent
« Reply #58 on: March 05, 2018, 23:40:12 »
OS maps from 1968-9 still show heights in feet, so it looks like 1970 would have marked the changeover.

Offline conan

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Re: OS Trig Points and Bench Marks in Kent
« Reply #57 on: March 05, 2018, 23:22:34 »
That benchmark is marked in metres,when did the OS convert from imperial to metric?
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Offline Longpockets

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Re: OS Trig Points and Bench Marks in Kent
« Reply #56 on: March 05, 2018, 19:16:03 »
On the OS Benchmarks web site it states -

"The network has had little maintenance for 30 years, and in some areas (mining areas for example), subsidence has affected the levelling values. In these regions the BMs cannot be relied upon to accurately define ODN."

"The BM heights shown have not been maintained for 30 years and should not be relied upon to accurately define ODN."

Not definitive but gives some idea.

Online filmer01

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Re: OS Trig Points and Bench Marks in Kent
« Reply #55 on: March 05, 2018, 16:33:52 »
Thatís the place. The boundaries and outbuildings look the same as those from a1960s photo, so about 1970 seems right for the map.

Anyone know when benchmarks stopped being used?
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Offline smiffy

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Re: OS Trig Points and Bench Marks in Kent
« Reply #54 on: March 05, 2018, 16:17:19 »
I think this might be it. This is from around 1970 so it looks like the benchmark is actually quite recent.


Online filmer01

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Re: OS Trig Points and Bench Marks in Kent
« Reply #53 on: March 05, 2018, 15:38:12 »
The NLS OS 25" map that Conan's link takes you to, also has a constantly updated map reference connected to the mouse pointer.

The position of "our" benchmark is at TQ866479, 586674, 147920 if that helps at all.
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Online filmer01

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Re: OS Trig Points and Bench Marks in Kent
« Reply #52 on: March 05, 2018, 08:49:03 »
Thanks Conan, but I have checked before and it does not show on any map that I have found so far. Curiously the two nearest are shown on road junctions where there are no buildings, either then or now.
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Offline conan

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Re: OS Trig Points and Bench Marks in Kent
« Reply #51 on: March 04, 2018, 21:47:34 »
Filmer01 if you check the location of your house on this OS map the benchmark should be shown and you can find out the height above sea level of your property.They are marked on the map with a broad arrow followed by a number which is the spot height.The 2 shown here are at Old Forge and Oak farm, both on the outskirts of Headcorn, the map is dragable to your location

http://maps.nls.uk/geo/explore/#zoom=18&lat=51.1709&lon=0.6252&layers=168&b=1

https://www.ordnancesurvey.co.uk/benchmarks/

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Online filmer01

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Re: OS Trig Points and Bench Marks in Kent
« Reply #50 on: March 04, 2018, 15:22:40 »
We uncovered this on the front wall of our old house, built early 1800s, on the Headcorn/Lenham Road.
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Offline Bryn Clinch

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Re: OS Trig Points and Bench Marks in Kent
« Reply #49 on: May 25, 2017, 15:45:20 »
St. James` Church, Bicknor. South facing wall to the left of the porch.

Offline Bryn Clinch

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Re: OS Trig Points and Bench Marks in Kent
« Reply #48 on: May 23, 2017, 14:19:18 »
St. Mary of Charity, Faversham  -  north wall.

Offline RonS

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Re: OS Trig Points and Bench Marks in Kent
« Reply #47 on: January 11, 2017, 12:20:33 »
http://www.bench-marks.org.uk/ provides a useful record of such things.

I have used this in reverse - using a GPS unit to discover the location of a lost building which, fortunately, once had a benchmark attached to it.

Offline CAT

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Re: OS Trig Points and Bench Marks in Kent
« Reply #46 on: December 09, 2016, 10:47:06 »
An elaborate bronze insert Bench Mark at St Leonard's Church, Upper Deal. The recesses would have been to attach a hanging bracket that would have enabled a piece of surveying equipment to be attached to aid in transferring the level to other locations.

Offline kyn

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Re: OS Trig Points and Bench Marks in Kent
« Reply #45 on: July 17, 2016, 16:01:37 »
St. Peter and St. Paul, Eythorne

Offline kyn

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Re: OS Trig Points and Bench Marks in Kent
« Reply #44 on: May 31, 2016, 22:14:11 »
St. Mary's, Nackington

 

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