How can I find out when a trig pillar was constructed?

General discussion about trigpoints, the TrigpointingUK website etc

How can I find out when a trig pillar was constructed?

Postby Monument Man » Wed Oct 09, 2019 4:38 pm

I was on Holyhead Mountain, Anglesey, North Wales on Sunday, 6 October 2019. There's an OS Hotine triangulation pillar on the summit at 220 metres (760 feet). It has the number S1633 on its cast 'level flush bracket' (I think that's what they call them?)
Can anyone tell me how I can find out on what date any particular trig point was constructed please?
Many thanks.
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Re: How can I find out when a trig pillar was constructed?

Postby agentmancuso » Thu Oct 10, 2019 4:45 pm

According to the OSGB36 extract on T:UK, the pillar was computed on 01/06/1952, presumably very shortly after physical construction.
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Re: How can I find out when a trig pillar was constructed?

Postby eon » Tue Oct 22, 2019 6:09 pm

The pillar was built on the 19th of November 1936 at a cost of £19 4s 6d. Last maintained by the OS in June of 1979.
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Re: How can I find out when a trig pillar was constructed?

Postby agentmancuso » Wed Oct 23, 2019 5:56 pm

eon wrote:The pillar was built on the 19th of November 1936 at a cost of £19 4s 6d. Last maintained by the OS in June of 1979.


It never occurred to me that there would be such a long delay between construction and computation. I wonder why; the war maybe?
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Re: How can I find out when a trig pillar was constructed?

Postby eon » Wed Oct 23, 2019 11:11 pm

It could well be that the war played a part in this, but looking through the list of pillars, most are computed not long - within a year, or two - of their construction. Even those built in the 30s/40s. But around that time, the sizable gap is more evident.
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