Re: [time-nuts] Visiting Greenwich

[Peter Torry via time-nuts]

Dave,

The rules have changed regarding photography for all National Trust 
properties so click away.


Regards

Peter


On 07/07/2016 21:41, Dave Martindale wrote:

Hmm.  When I was there yesterday I didn't see any "No Photography" signs,
so I photographed lots of the exhibits, including the four Harrisons . I
used flash, so I wasn't the least bit stealthy, and one of the staff was
only a few feet away.  Maybe they no longer care?

Dave

On Wednesday, 6 July 2016, Morris Odell  wrote:


  I can recommend the climb up the hill at Greenwich to anyone - it's
definitely worth the effort. They didn't allow photography of the Harrison
clocks but I did manage to sneak one or two before the minder got to me :-)

Morris
Melbourne, Australia



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Re: [time-nuts] Visiting Greenwich

[Dave Martindale]

Hmm.  When I was there yesterday I didn't see any "No Photography" signs,
so I photographed lots of the exhibits, including the four Harrisons . I
used flash, so I wasn't the least bit stealthy, and one of the staff was
only a few feet away.  Maybe they no longer care?

Dave

On Wednesday, 6 July 2016, Morris Odell  wrote:

>  I can recommend the climb up the hill at Greenwich to anyone - it's
> definitely worth the effort. They didn't allow photography of the Harrison
> clocks but I did manage to sneak one or two before the minder got to me :-)
>
> Morris
> Melbourne, Australia
>
>
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Re: [time-nuts] Visiting Greenwich

[Bill Hawkins]

Hi Morris,

The idea of the author of "A Brief History of Time" telling the time
briefly has a certain appeal. 
Can you share some construction details? Even a parts list would be
useful.

Thanks,
Bill Hawkins


-Original Message-
From: Morris Odell
Sent: Wednesday, July 06, 2016 5:32 PM

This is a terrific thread. I have been to Greenwich too and also some of
the clock exhibits in London. There's a beautiful pendulum master and
slave clock set up in the British Museum, and there's an original huge
Caesium (British spelling!)  frequency standard in the Kensington
Science Museum. 
The last time I was there in 2013 there was also a special feature
exhibition about Alan Turing and the Bletchley code breakers.  I did
pass through Bletchley station on the train about 20 years ago when I
was in the UK but regrettably didn't have the time to stop there. I can
recommend the climb up the hill at Greenwich to anyone - it's definitely
worth the effort. 
They didn't allow photography of the Harrison clocks but I did manage to
sneak one or two before the minder got to me :-)

I'd love to have a genuine electro-optical speaking clock. There's one
in the Australian Telecom museum not far from where I live. There's also
a terrific display of a complete electromechanical telephone exchange
including a speaking clock in the telecommunications museum in Stockholm
but as I don't speak Swedish I couldn't understand what it was saying.
I've just finished making a speaking clock using more modern technology,
it uses a 30 year old speech synthesizer chip and sounds just like
Stephen Hawking.

Morris
Melbourne, Australia


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Re: [time-nuts] Visiting Greenwich

[Jim Harman]

Those in Australia might want to check out the traveling "ships, clocks,
and stars" exhibit at the Australian National Maritime Museum in Sydney
through Oct 30. I saw this earlier this year when it was in Mystic
Connecticut and found it very interesting. It is also appropriate for non
Time Nuts. It presents a good overview of the quest for longitude at sea
and features beautiful working replicas of Harrison's clocks.

On Wed, Jul 6, 2016, 7:46 PM Morris Odell <vilgo...@bigpond.net.au> wrote:

> This is a terrific thread. I have been to Greenwich too and also some of
> the
> clock exhibits in London. There's a beautiful pendulum master and slave
> clock set up in the British Museum, and there's an original huge Caesium
> (British spelling!)  frequency standard in the Kensington Science Museum.
> The last time I was there in 2013 there was also a special feature
> exhibition about Alan Turing and the Bletchley code breakers.  I did pass
> through Bletchley station on the train about 20 years ago when I was in the
> UK but regrettably didn't have the time to stop there. I can recommend the
> climb up the hill at Greenwich to anyone - it's definitely worth the
> effort.
> They didn't allow photography of the Harrison clocks but I did manage to
> sneak one or two before the minder got to me :-)
>
> I'd love to have a genuine electro-optical speaking clock. There's one in
> the Australian Telecom museum not far from where I live. There's also a
> terrific display of a complete electromechanical telephone exchange
> including a speaking clock in the telecommunications museum in Stockholm
> but
> as I don't speak Swedish I couldn't understand what it was saying.  I've
> just finished making a speaking clock using more modern technology, it uses
> a 30 year old speech synthesizer chip and sounds just like Stephen Hawking.
>
> Morris
> Melbourne, Australia
> -
>Date: Wed, 6 Jul 2016 10:42:19 +1000
> From: Jim Palfreyman <jim77...@gmail.com>
> To: Discussion of precise time and frequency measurement
> <time-nuts@febo.com>
> Subject: Re: [time-nuts] Visiting Greenwich
>
> Speaking of "speaking clocks" - here's two photos of the ones that used to
> be used in Australia:
>
> https://en.wikipedia.org/wiki/Speaking_clock#Australia
>
> The top photo with rotating optical disks is a gorgeous piece of machinery.
>
> The one below - I have one, and I keep it running.
>
> :-)
>
>
>
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
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Re: [time-nuts] Visiting Greenwich

[Morris Odell]

This is a terrific thread. I have been to Greenwich too and also some of the 
clock exhibits in London. There's a beautiful pendulum master and slave 
clock set up in the British Museum, and there's an original huge Caesium 
(British spelling!)  frequency standard in the Kensington Science Museum. 
The last time I was there in 2013 there was also a special feature 
exhibition about Alan Turing and the Bletchley code breakers.  I did pass 
through Bletchley station on the train about 20 years ago when I was in the 
UK but regrettably didn't have the time to stop there. I can recommend the 
climb up the hill at Greenwich to anyone - it's definitely worth the effort. 
They didn't allow photography of the Harrison clocks but I did manage to 
sneak one or two before the minder got to me :-)


I'd love to have a genuine electro-optical speaking clock. There's one in 
the Australian Telecom museum not far from where I live. There's also a 
terrific display of a complete electromechanical telephone exchange 
including a speaking clock in the telecommunications museum in Stockholm but 
as I don't speak Swedish I couldn't understand what it was saying.  I've 
just finished making a speaking clock using more modern technology, it uses 
a 30 year old speech synthesizer chip and sounds just like Stephen Hawking.


Morris
Melbourne, Australia
-
  Date: Wed, 6 Jul 2016 10:42:19 +1000
From: Jim Palfreyman <jim77...@gmail.com>
To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Subject: Re: [time-nuts] Visiting Greenwich

Speaking of "speaking clocks" - here's two photos of the ones that used to
be used in Australia:

https://en.wikipedia.org/wiki/Speaking_clock#Australia

The top photo with rotating optical disks is a gorgeous piece of machinery.

The one below - I have one, and I keep it running.

:-)



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Re: [time-nuts] Visiting Greenwich

[Peter Torry via time-nuts]

The original speaking clock ( in use from 1936 to 1963) has been 
restored to working order and is on show at the British Horological 
Institute at Upton Hall near Newark (UK). Speaking clock N0 2 that 
replaced No 1 is quartz controlled and also on view at Upton hall.  If 
anyone would like details of them just let me know.


Peter Torry



On 06/07/2016 06:20, Dave Brown wrote:
I have a pdf of a POEEJ article on the speaking clock that came into 
service 24 July 1936 if anyone is interested. I suspect this predates 
the one under discussion? I also have a two part article on the Mark 2 
built in the UK for Australia.(mid 1950s)

DaveB, NZ






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Re: [time-nuts] Visiting Greenwich

[Dave Brown]

I have a pdf of a POEEJ article on the speaking clock that came into service 
24 July 1936 if anyone is interested. I suspect this predates the one under 
discussion? I also have a two part article on the Mark 2 built in the UK for 
Australia.(mid 1950s)

DaveB, NZ


- Original Message - 
From: "Alan Melia" <alan.me...@btinternet.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts@febo.com>

Sent: Wednesday, July 06, 2016 10:17 AM
Subject: Re: [time-nuts] Visiting Greenwich


Hi Clint I think when I discussed this last a few years ago with the 
speaking clock designer and David Rooney the man responsible for the time 
gallery at Greenwich. The clock is an early quartz unit, probably made at 
the then Post Office Reseach Labs at Dollis Hill in NW London.  The clock 
is quite a beast ! It was found in a skip (Dumpster) having been donated 
to a university in the late 1940s, and was refurbished by a local 
enthusiast for David. He did a good job because I believe he had no access 
to any documents or circuits. I tried to find some information but it 
would seem the archive has been lost (vandals !!) It probably contains 
strange things like neon ring counters :-))


Alan
G3NYK

- Original Message - 
From: "Clint Jay" <cjaysh...@gmail.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts@febo.com>

Sent: Tuesday, July 05, 2016 9:13 PM
Subject: Re: [time-nuts] Visiting Greenwich



They also have TIM the speaking clock which has a rack mounted  atomic
standard.
On 5 Jul 2016 21:01, "John Dalziel - crashposition" 
<j...@crashposition.com>

wrote:

I would also recommend the Worshipful Company of Clockmakers collection 
at

the Science Museum. It’s a great collection and they have some of
Harrison's wooden long case clocks as well as his final chronometer, H5.


http://www.sciencemuseum.org.uk/visitmuseum/plan_your_visit/exhibitions/clockmakers-museum


John Dalziel
computus.org


Message: 4
Date: Mon, 4 Jul 2016 18:31:35 -0400
From: Dave Martindale <dave.martind...@gmail.com>
To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Subject: [time-nuts] Visiting Greenwich
Message-ID:
<caju10sv0gzufmsj5o3eoewwf40eoktytranlbzfg8kvw6kc...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

I am in London England at the moment, playing tourist with the rest of 
my

family. I want one day to be a visit to the National Maritime Museum at
Greenwich, which includes the Royal Observatory Greenwich. I am
particularly interested in seeing Harrison's H1 through H4, plus other
high-precision mechanical timekeepers (pendulum clocks, etc).

I know they are at the NMM - their web site shows some of them. But 
where
are they located on the site? The NMM has a large main building down 
near

the Thames, while the Royal Observatory and related buildings are on the
top of a hill further inland in Greenwich Park. Are the chronometers and
other precision timekeepers on display somewhere in the Royal 
Observatory,

or down in the main NMM building? I've spent an hour or two browsing web
sites without finding this particular bit of information.

I figure there must be list members who have visited the NMM, and know
where the precision timekeepers are actually displayed.

Thanks,
Dave
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Re: [time-nuts] Visiting Greenwich

[David I. Emery]

On Tue, Jul 05, 2016 at 10:20:14PM -0400, David I. Emery wrote:
> 
>   I might add I have been to Bletchly park myself but have been
> waiting for a return visit with my son (who will graduate with a CS degree
> in a year - and a biochem degree) rather than take my wife who really
> isn't all that into what it means...

Apologies... meant for a friend... not the list...


-- 
  Dave Emery N1PRE/AE, d...@dieconsulting.com  DIE Consulting, Weston, Mass 
02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in 
celebration of what could have been, but wasn't and is not to be now either."

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Re: [time-nuts] Visiting Greenwich

[Eric Scace]

Also in London, and not to be missed, is James Nye’s Clockworks Museum 
 of precision astronomical regulators and 
electro-mechanical clocks, including working examples of each of the successive 
generations of top-accuracy pendulum clocks (Riefler, Shortt-Syncronome, 
Fedchenko).


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Re: [time-nuts] Visiting Greenwich

[David I. Emery]

I might add I have been to Bletchly park myself but have been
waiting for a return visit with my son (who will graduate with a CS degree
in a year - and a biochem degree) rather than take my wife who really
isn't all that into what it means...




On Tue, Jul 05, 2016 at 12:18:59PM -0400, William H. Fite wrote:
> I second the motion, John, re Bletchley Park. My spouse is a quantum
> information theorist (sort of a cross between a quantum physicist and a
> theoretical mathematician) who develops algorithms that crypto people then
> adapt for practical use. Mostly for quantum crypto. Both of us found
> Bletchley absolutely fascinating. That was a couple of years ago and we
> found several enthusiastic volunteers including one who was a pretty fair
> mathematician.
> 
> On Tue, Jul 5, 2016 at 8:10 AM, John Ackermann N8UR  wrote:
> 
> > I'm a bit of a crypto-geek and was able to visit Bletchley a couple of
> > times, again many years ago.  It is definitely worth a trip, though from
> > what I saw on my visits and have read lately it has evolved badly.
> >
> > It used to be run on a shoestring with enthusiastic volunteers everywhere
> > and lots of eccentric touches.  There were local craft clubs who set up on
> > their niche historical displays on the weekends, there was a guy who'd
> > taken over the front room of the manor with his huge Churchill memorabilia
> > collection, and though things weren't fancy they were lots of fun.  Over
> > the years, though, the site has been "corporatized" and while the exhibits
> > have gotten fancier, some of the fun has gone away, and a lot of the
> > passionate volunteers seem to have given up.
> >
> > My last visit was years ago, though, and I hope that what I've read about
> > what's happened since is overstated.
> >
> > John
> >
> >
> > On 7/4/2016 10:01 PM, Bob wrote:
> >
> >> Hi Dave,
> >>
> >> Yes, as many mentioned all the clocks are up the hill at the Observatory,
> >> and very much worth the trip.  As you mention you are with your family, I
> >> would like to add that yes I did cajole my family to the NMM and the
> >> Observatory, but also to Bletchley Park (just a short train ride outside
> >> London) and Bletchley Park was easily the most memorable.  There are
> >> wonderful volunteer guides, and many interesting devices that you can get
> >> up close to.  Bletchley was more like visiting a working lab than a
> >> museum.  I think every time nut would enjoy Bletchley quite a bit.
> >>
> >> https://www.bletchleypark.org.uk/ 
> >>
> >> Cheers,
> >>
> >> Bob
> >>
> >> On Jul 4, 2016, at 6:31 PM, Dave Martindale 
> >>> wrote:
> >>>
> >>> I am in London England at the moment, playing tourist with the rest of my
> >>> family.  I want one day to be a visit to the National Maritime Museum at
> >>> Greenwich, which includes the Royal Observatory Greenwich.  I am
> >>> particularly interested in seeing Harrison's H1 through H4, plus other
> >>> high-precision mechanical timekeepers (pendulum clocks, etc).
> >>>
> >>> I know they are at the NMM - their web site shows some of them.  But
> >>> where
> >>> are they located on the site?  The NMM has a large main building down
> >>> near
> >>> the Thames, while the Royal Observatory and related buildings are on the
> >>> top of a hill further inland in Greenwich Park.  Are the chronometers and
> >>> other precision timekeepers on display somewhere in the Royal
> >>> Observatory,
> >>> or down in the main NMM building?  I've spent an hour or two browsing web
> >>> sites without finding this particular bit of information.
> >>>
> >>> I figure there must be list members who have visited the NMM, and know
> >>> where the precision timekeepers are actually displayed.
> >>>
> >>> Thanks,
> >>> Dave
> >>> ___
> >>> time-nuts mailing list -- time-nuts@febo.com
> >>> To unsubscribe, go to
> >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >>> and follow the instructions there.
> >>>
> >>
> >> ___
> >> time-nuts mailing list -- time-nuts@febo.com
> >> To unsubscribe, go to
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> >> and follow the instructions there.
> >>
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> >>
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> > and follow the instructions there.
> >
> 
> 
> 
> -- 
> Mundus vult decipi.
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> and 

Re: [time-nuts] Visiting Greenwich

[Jim Palfreyman]

Speaking of "speaking clocks" - here's two photos of the ones that used to
be used in Australia:

https://en.wikipedia.org/wiki/Speaking_clock#Australia

The top photo with rotating optical disks is a gorgeous piece of machinery.

The one below - I have one, and I keep it running.

:-)


On 6 July 2016 at 09:30, Clint Jay <cjaysh...@gmail.com> wrote:

> Actually,  you're absolutely right,  the speaking clock is on an upper
> gallery display with other timepieces, some of which are amazing.
>
> I've just looked back through my photo gallery and it's the Greenwich time
> service I'm thinking of, a large, five rack wide system that's got (from my
> obviously flaky memory) a Loran receiver and an atomic standard.
>
> Small pic attached.
> On 5 Jul 2016 23:28, "Alan Melia" <alan.me...@btinternet.com> wrote:
>
> > Hi Clint I think when I discussed this last a few years ago with the
> > speaking clock designer and David Rooney the man responsible for the time
> > gallery at Greenwich. The clock is an early quartz unit, probably made at
> > the then Post Office Reseach Labs at Dollis Hill in NW London.  The clock
> > is quite a beast ! It was found in a skip (Dumpster) having been donated
> to
> > a university in the late 1940s, and was refurbished by a local enthusiast
> > for David. He did a good job because I believe he had no access to any
> > documents or circuits. I tried to find some information but it would seem
> > the archive has been lost (vandals !!) It probably contains strange
> things
> > like neon ring counters :-))
> >
> > Alan
> > G3NYK
> >
> > - Original Message - From: "Clint Jay" <cjaysh...@gmail.com>
> > To: "Discussion of precise time and frequency measurement" <
> > time-nuts@febo.com>
> > Sent: Tuesday, July 05, 2016 9:13 PM
> > Subject: Re: [time-nuts] Visiting Greenwich
> >
> >
> > They also have TIM the speaking clock which has a rack mounted  atomic
> >> standard.
> >> On 5 Jul 2016 21:01, "John Dalziel - crashposition" <
> >> j...@crashposition.com>
> >> wrote:
> >>
> >> I would also recommend the Worshipful Company of Clockmakers collection
> at
> >>> the Science Museum. It’s a great collection and they have some of
> >>> Harrison's wooden long case clocks as well as his final chronometer,
> H5.
> >>>
> >>>
> >>>
> >>>
> http://www.sciencemuseum.org.uk/visitmuseum/plan_your_visit/exhibitions/clockmakers-museum
> >>>
> >>>
> >>> John Dalziel
> >>> computus.org
> >>>
> >>>
> >>> Message: 4
> >>> Date: Mon, 4 Jul 2016 18:31:35 -0400
> >>> From: Dave Martindale <dave.martind...@gmail.com>
> >>> To: Discussion of precise time and frequency measurement
> >>> <time-nuts@febo.com>
> >>> Subject: [time-nuts] Visiting Greenwich
> >>> Message-ID:
> >>> <caju10sv0gzufmsj5o3eoewwf40eoktytranlbzfg8kvw6kc...@mail.gmail.com>
> >>> Content-Type: text/plain; charset=UTF-8
> >>>
> >>> I am in London England at the moment, playing tourist with the rest of
> my
> >>> family. I want one day to be a visit to the National Maritime Museum at
> >>> Greenwich, which includes the Royal Observatory Greenwich. I am
> >>> particularly interested in seeing Harrison's H1 through H4, plus other
> >>> high-precision mechanical timekeepers (pendulum clocks, etc).
> >>>
> >>> I know they are at the NMM - their web site shows some of them. But
> where
> >>> are they located on the site? The NMM has a large main building down
> near
> >>> the Thames, while the Royal Observatory and related buildings are on
> the
> >>> top of a hill further inland in Greenwich Park. Are the chronometers
> and
> >>> other precision timekeepers on display somewhere in the Royal
> >>> Observatory,
> >>> or down in the main NMM building? I've spent an hour or two browsing
> web
> >>> sites without finding this particular bit of information.
> >>>
> >>> I figure there must be list members who have visited the NMM, and know
> >>> where the precision timekeepers are actually displayed.
> >>>
> >>> Thanks,
> >>> Dave
> >>> ___
> >>> time-nuts mailing list -- time-nuts@febo.com
> >>> To unsubscribe, go to
> >>> ht

Re: [time-nuts] Visiting Greenwich

[William H. Fite]

Looks like a control panel out of a 1950s space movie.



On Tuesday, July 5, 2016, Clint Jay <cjaysh...@gmail.com> wrote:

> Actually,  you're absolutely right,  the speaking clock is on an upper
> gallery display with other timepieces, some of which are amazing.
>
> I've just looked back through my photo gallery and it's the Greenwich time
> service I'm thinking of, a large, five rack wide system that's got (from my
> obviously flaky memory) a Loran receiver and an atomic standard.
>
> Small pic attached.
> On 5 Jul 2016 23:28, "Alan Melia" <alan.me...@btinternet.com
> <javascript:;>> wrote:
>
> > Hi Clint I think when I discussed this last a few years ago with the
> > speaking clock designer and David Rooney the man responsible for the time
> > gallery at Greenwich. The clock is an early quartz unit, probably made at
> > the then Post Office Reseach Labs at Dollis Hill in NW London.  The clock
> > is quite a beast ! It was found in a skip (Dumpster) having been donated
> to
> > a university in the late 1940s, and was refurbished by a local enthusiast
> > for David. He did a good job because I believe he had no access to any
> > documents or circuits. I tried to find some information but it would seem
> > the archive has been lost (vandals !!) It probably contains strange
> things
> > like neon ring counters :-))
> >
> > Alan
> > G3NYK
> >
> > - Original Message - From: "Clint Jay" <cjaysh...@gmail.com
> <javascript:;>>
> > To: "Discussion of precise time and frequency measurement" <
> > time-nuts@febo.com <javascript:;>>
> > Sent: Tuesday, July 05, 2016 9:13 PM
> > Subject: Re: [time-nuts] Visiting Greenwich
> >
> >
> > They also have TIM the speaking clock which has a rack mounted  atomic
> >> standard.
> >> On 5 Jul 2016 21:01, "John Dalziel - crashposition" <
> >> j...@crashposition.com <javascript:;>>
> >> wrote:
> >>
> >> I would also recommend the Worshipful Company of Clockmakers collection
> at
> >>> the Science Museum. It’s a great collection and they have some of
> >>> Harrison's wooden long case clocks as well as his final chronometer,
> H5.
> >>>
> >>>
> >>>
> >>>
> http://www.sciencemuseum.org.uk/visitmuseum/plan_your_visit/exhibitions/clockmakers-museum
> >>>
> >>>
> >>> John Dalziel
> >>> computus.org
> >>>
> >>>
> >>> Message: 4
> >>> Date: Mon, 4 Jul 2016 18:31:35 -0400
> >>> From: Dave Martindale <dave.martind...@gmail.com <javascript:;>>
> >>> To: Discussion of precise time and frequency measurement
> >>> <time-nuts@febo.com <javascript:;>>
> >>> Subject: [time-nuts] Visiting Greenwich
> >>> Message-ID:
> >>> <caju10sv0gzufmsj5o3eoewwf40eoktytranlbzfg8kvw6kc...@mail.gmail.com
> <javascript:;>>
> >>> Content-Type: text/plain; charset=UTF-8
> >>>
> >>> I am in London England at the moment, playing tourist with the rest of
> my
> >>> family. I want one day to be a visit to the National Maritime Museum at
> >>> Greenwich, which includes the Royal Observatory Greenwich. I am
> >>> particularly interested in seeing Harrison's H1 through H4, plus other
> >>> high-precision mechanical timekeepers (pendulum clocks, etc).
> >>>
> >>> I know they are at the NMM - their web site shows some of them. But
> where
> >>> are they located on the site? The NMM has a large main building down
> near
> >>> the Thames, while the Royal Observatory and related buildings are on
> the
> >>> top of a hill further inland in Greenwich Park. Are the chronometers
> and
> >>> other precision timekeepers on display somewhere in the Royal
> >>> Observatory,
> >>> or down in the main NMM building? I've spent an hour or two browsing
> web
> >>> sites without finding this particular bit of information.
> >>>
> >>> I figure there must be list members who have visited the NMM, and know
> >>> where the precision timekeepers are actually displayed.
> >>>
> >>> Thanks,
> >>> Dave
> >>> ___
> >>> time-nuts mailing list -- time-nuts@febo.com <javascript:;>
> >>> To unsubscribe, go to
> >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >>> and follow the instructions there.
> >>>
> >>> ___
> >> time-nuts mailing list -- time-nuts@febo.com <javascript:;>
> >> To unsubscribe, go to
> >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >> and follow the instructions there.
> >>
> >
> > ___
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> > To unsubscribe, go to
> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
> >
>


-- 
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Re: [time-nuts] Visiting Greenwich

[William H. Fite]

The ring counters are called dekatrons. I built a clock/timer using them
when I was 12 or so.


On Tuesday, July 5, 2016, Alan Melia <alan.me...@btinternet.com> wrote:

> Hi Clint I think when I discussed this last a few years ago with the
> speaking clock designer and David Rooney the man responsible for the time
> gallery at Greenwich. The clock is an early quartz unit, probably made at
> the then Post Office Reseach Labs at Dollis Hill in NW London.  The clock
> is quite a beast ! It was found in a skip (Dumpster) having been donated to
> a university in the late 1940s, and was refurbished by a local enthusiast
> for David. He did a good job because I believe he had no access to any
> documents or circuits. I tried to find some information but it would seem
> the archive has been lost (vandals !!) It probably contains strange things
> like neon ring counters :-))
>
> Alan
> G3NYK
>
> - Original Message - From: "Clint Jay" <cjaysh...@gmail.com>
> To: "Discussion of precise time and frequency measurement" <
> time-nuts@febo.com>
> Sent: Tuesday, July 05, 2016 9:13 PM
> Subject: Re: [time-nuts] Visiting Greenwich
>
>
> They also have TIM the speaking clock which has a rack mounted  atomic
>> standard.
>> On 5 Jul 2016 21:01, "John Dalziel - crashposition" <
>> j...@crashposition.com>
>> wrote:
>>
>> I would also recommend the Worshipful Company of Clockmakers collection at
>>> the Science Museum. It’s a great collection and they have some of
>>> Harrison's wooden long case clocks as well as his final chronometer, H5.
>>>
>>>
>>>
>>> http://www.sciencemuseum.org.uk/visitmuseum/plan_your_visit/exhibitions/clockmakers-museum
>>>
>>>
>>> John Dalziel
>>> computus.org
>>>
>>>
>>> Message: 4
>>> Date: Mon, 4 Jul 2016 18:31:35 -0400
>>> From: Dave Martindale <dave.martind...@gmail.com>
>>> To: Discussion of precise time and frequency measurement
>>> <time-nuts@febo.com>
>>> Subject: [time-nuts] Visiting Greenwich
>>> Message-ID:
>>> <caju10sv0gzufmsj5o3eoewwf40eoktytranlbzfg8kvw6kc...@mail.gmail.com>
>>> Content-Type: text/plain; charset=UTF-8
>>>
>>> I am in London England at the moment, playing tourist with the rest of my
>>> family. I want one day to be a visit to the National Maritime Museum at
>>> Greenwich, which includes the Royal Observatory Greenwich. I am
>>> particularly interested in seeing Harrison's H1 through H4, plus other
>>> high-precision mechanical timekeepers (pendulum clocks, etc).
>>>
>>> I know they are at the NMM - their web site shows some of them. But where
>>> are they located on the site? The NMM has a large main building down near
>>> the Thames, while the Royal Observatory and related buildings are on the
>>> top of a hill further inland in Greenwich Park. Are the chronometers and
>>> other precision timekeepers on display somewhere in the Royal
>>> Observatory,
>>> or down in the main NMM building? I've spent an hour or two browsing web
>>> sites without finding this particular bit of information.
>>>
>>> I figure there must be list members who have visited the NMM, and know
>>> where the precision timekeepers are actually displayed.
>>>
>>> Thanks,
>>> Dave
>>> ___
>>> time-nuts mailing list -- time-nuts@febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>>> ___
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>


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Re: [time-nuts] Visiting Greenwich

[Clint Jay]

Actually,  you're absolutely right,  the speaking clock is on an upper
gallery display with other timepieces, some of which are amazing.

I've just looked back through my photo gallery and it's the Greenwich time
service I'm thinking of, a large, five rack wide system that's got (from my
obviously flaky memory) a Loran receiver and an atomic standard.

Small pic attached.
On 5 Jul 2016 23:28, "Alan Melia" <alan.me...@btinternet.com> wrote:

> Hi Clint I think when I discussed this last a few years ago with the
> speaking clock designer and David Rooney the man responsible for the time
> gallery at Greenwich. The clock is an early quartz unit, probably made at
> the then Post Office Reseach Labs at Dollis Hill in NW London.  The clock
> is quite a beast ! It was found in a skip (Dumpster) having been donated to
> a university in the late 1940s, and was refurbished by a local enthusiast
> for David. He did a good job because I believe he had no access to any
> documents or circuits. I tried to find some information but it would seem
> the archive has been lost (vandals !!) It probably contains strange things
> like neon ring counters :-))
>
> Alan
> G3NYK
>
> - Original Message - From: "Clint Jay" <cjaysh...@gmail.com>
> To: "Discussion of precise time and frequency measurement" <
> time-nuts@febo.com>
> Sent: Tuesday, July 05, 2016 9:13 PM
> Subject: Re: [time-nuts] Visiting Greenwich
>
>
> They also have TIM the speaking clock which has a rack mounted  atomic
>> standard.
>> On 5 Jul 2016 21:01, "John Dalziel - crashposition" <
>> j...@crashposition.com>
>> wrote:
>>
>> I would also recommend the Worshipful Company of Clockmakers collection at
>>> the Science Museum. It’s a great collection and they have some of
>>> Harrison's wooden long case clocks as well as his final chronometer, H5.
>>>
>>>
>>>
>>> http://www.sciencemuseum.org.uk/visitmuseum/plan_your_visit/exhibitions/clockmakers-museum
>>>
>>>
>>> John Dalziel
>>> computus.org
>>>
>>>
>>> Message: 4
>>> Date: Mon, 4 Jul 2016 18:31:35 -0400
>>> From: Dave Martindale <dave.martind...@gmail.com>
>>> To: Discussion of precise time and frequency measurement
>>> <time-nuts@febo.com>
>>> Subject: [time-nuts] Visiting Greenwich
>>> Message-ID:
>>> <caju10sv0gzufmsj5o3eoewwf40eoktytranlbzfg8kvw6kc...@mail.gmail.com>
>>> Content-Type: text/plain; charset=UTF-8
>>>
>>> I am in London England at the moment, playing tourist with the rest of my
>>> family. I want one day to be a visit to the National Maritime Museum at
>>> Greenwich, which includes the Royal Observatory Greenwich. I am
>>> particularly interested in seeing Harrison's H1 through H4, plus other
>>> high-precision mechanical timekeepers (pendulum clocks, etc).
>>>
>>> I know they are at the NMM - their web site shows some of them. But where
>>> are they located on the site? The NMM has a large main building down near
>>> the Thames, while the Royal Observatory and related buildings are on the
>>> top of a hill further inland in Greenwich Park. Are the chronometers and
>>> other precision timekeepers on display somewhere in the Royal
>>> Observatory,
>>> or down in the main NMM building? I've spent an hour or two browsing web
>>> sites without finding this particular bit of information.
>>>
>>> I figure there must be list members who have visited the NMM, and know
>>> where the precision timekeepers are actually displayed.
>>>
>>> Thanks,
>>> Dave
>>> ___
>>> time-nuts mailing list -- time-nuts@febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>>> ___
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>
> ___
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> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
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Re: [time-nuts] Visiting Greenwich

[Alan Melia]

Hi Clint I think when I discussed this last a few years ago with the 
speaking clock designer and David Rooney the man responsible for the time 
gallery at Greenwich. The clock is an early quartz unit, probably made at 
the then Post Office Reseach Labs at Dollis Hill in NW London.  The clock is 
quite a beast ! It was found in a skip (Dumpster) having been donated to a 
university in the late 1940s, and was refurbished by a local enthusiast for 
David. He did a good job because I believe he had no access to any documents 
or circuits. I tried to find some information but it would seem the archive 
has been lost (vandals !!) It probably contains strange things like neon 
ring counters :-))


Alan
G3NYK

- Original Message - 
From: "Clint Jay" <cjaysh...@gmail.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts@febo.com>

Sent: Tuesday, July 05, 2016 9:13 PM
Subject: Re: [time-nuts] Visiting Greenwich



They also have TIM the speaking clock which has a rack mounted  atomic
standard.
On 5 Jul 2016 21:01, "John Dalziel - crashposition" 
<j...@crashposition.com>

wrote:

I would also recommend the Worshipful Company of Clockmakers collection 
at

the Science Museum. It’s a great collection and they have some of
Harrison's wooden long case clocks as well as his final chronometer, H5.


http://www.sciencemuseum.org.uk/visitmuseum/plan_your_visit/exhibitions/clockmakers-museum


John Dalziel
computus.org


Message: 4
Date: Mon, 4 Jul 2016 18:31:35 -0400
From: Dave Martindale <dave.martind...@gmail.com>
To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Subject: [time-nuts] Visiting Greenwich
Message-ID:
<caju10sv0gzufmsj5o3eoewwf40eoktytranlbzfg8kvw6kc...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

I am in London England at the moment, playing tourist with the rest of my
family. I want one day to be a visit to the National Maritime Museum at
Greenwich, which includes the Royal Observatory Greenwich. I am
particularly interested in seeing Harrison's H1 through H4, plus other
high-precision mechanical timekeepers (pendulum clocks, etc).

I know they are at the NMM - their web site shows some of them. But where
are they located on the site? The NMM has a large main building down near
the Thames, while the Royal Observatory and related buildings are on the
top of a hill further inland in Greenwich Park. Are the chronometers and
other precision timekeepers on display somewhere in the Royal 
Observatory,

or down in the main NMM building? I've spent an hour or two browsing web
sites without finding this particular bit of information.

I figure there must be list members who have visited the NMM, and know
where the precision timekeepers are actually displayed.

Thanks,
Dave
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Re: [time-nuts] Visiting Greenwich

[Clint Jay]

They also have TIM the speaking clock which has a rack mounted  atomic
standard.
On 5 Jul 2016 21:01, "John Dalziel - crashposition" 
wrote:

> I would also recommend the Worshipful Company of Clockmakers collection at
> the Science Museum. It’s a great collection and they have some of
> Harrison's wooden long case clocks as well as his final chronometer, H5.
>
>
> http://www.sciencemuseum.org.uk/visitmuseum/plan_your_visit/exhibitions/clockmakers-museum
>
>
> John Dalziel
> computus.org
>
>
> Message: 4
> Date: Mon, 4 Jul 2016 18:31:35 -0400
> From: Dave Martindale 
> To: Discussion of precise time and frequency measurement
> 
> Subject: [time-nuts] Visiting Greenwich
> Message-ID:
> 
> Content-Type: text/plain; charset=UTF-8
>
> I am in London England at the moment, playing tourist with the rest of my
> family. I want one day to be a visit to the National Maritime Museum at
> Greenwich, which includes the Royal Observatory Greenwich. I am
> particularly interested in seeing Harrison's H1 through H4, plus other
> high-precision mechanical timekeepers (pendulum clocks, etc).
>
> I know they are at the NMM - their web site shows some of them. But where
> are they located on the site? The NMM has a large main building down near
> the Thames, while the Royal Observatory and related buildings are on the
> top of a hill further inland in Greenwich Park. Are the chronometers and
> other precision timekeepers on display somewhere in the Royal Observatory,
> or down in the main NMM building? I've spent an hour or two browsing web
> sites without finding this particular bit of information.
>
> I figure there must be list members who have visited the NMM, and know
> where the precision timekeepers are actually displayed.
>
> Thanks,
> Dave
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
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Re: [time-nuts] Visiting Greenwich

[John Dalziel - crashposition]

I would also recommend the Worshipful Company of Clockmakers collection at the 
Science Museum. It’s a great collection and they have some of Harrison's wooden 
long case clocks as well as his final chronometer, H5.

http://www.sciencemuseum.org.uk/visitmuseum/plan_your_visit/exhibitions/clockmakers-museum


John Dalziel
computus.org


Message: 4  
Date: Mon, 4 Jul 2016 18:31:35 -0400  
From: Dave Martindale   
To: Discussion of precise time and frequency measurement  
  
Subject: [time-nuts] Visiting Greenwich  
Message-ID:  
  
Content-Type: text/plain; charset=UTF-8  

I am in London England at the moment, playing tourist with the rest of my  
family. I want one day to be a visit to the National Maritime Museum at  
Greenwich, which includes the Royal Observatory Greenwich. I am  
particularly interested in seeing Harrison's H1 through H4, plus other  
high-precision mechanical timekeepers (pendulum clocks, etc).  

I know they are at the NMM - their web site shows some of them. But where  
are they located on the site? The NMM has a large main building down near  
the Thames, while the Royal Observatory and related buildings are on the  
top of a hill further inland in Greenwich Park. Are the chronometers and  
other precision timekeepers on display somewhere in the Royal Observatory,  
or down in the main NMM building? I've spent an hour or two browsing web  
sites without finding this particular bit of information.  

I figure there must be list members who have visited the NMM, and know  
where the precision timekeepers are actually displayed.  

Thanks,  
Dave  
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Re: [time-nuts] Visiting Greenwich

[jimlux]

On 7/5/16 9:18 AM, William H. Fite wrote:

I second the motion, John, re Bletchley Park. My spouse is a quantum
information theorist (sort of a cross between a quantum physicist and a
theoretical mathematician) who develops algorithms that crypto people then
adapt for practical use. Mostly for quantum crypto. Both of us found
Bletchley absolutely fascinating. That was a couple of years ago and we
found several enthusiastic volunteers including one who was a pretty fair
mathematician.



A coworker who is technologically sophisticated (like time-nuts in 
general, although time is not one of his particular interests) went last 
year (after the renovations essentially paid for by the movie production 
company).  He greatly enjoyed it, especially because they were running 
the Bombe when he was there.  Plenty of opportunity to talk to people 
actually doing stuff, not just docents or tour guides.





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Re: [time-nuts] Visiting Greenwich

[William H. Fite]

I second the motion, John, re Bletchley Park. My spouse is a quantum
information theorist (sort of a cross between a quantum physicist and a
theoretical mathematician) who develops algorithms that crypto people then
adapt for practical use. Mostly for quantum crypto. Both of us found
Bletchley absolutely fascinating. That was a couple of years ago and we
found several enthusiastic volunteers including one who was a pretty fair
mathematician.

On Tue, Jul 5, 2016 at 8:10 AM, John Ackermann N8UR  wrote:

> I'm a bit of a crypto-geek and was able to visit Bletchley a couple of
> times, again many years ago.  It is definitely worth a trip, though from
> what I saw on my visits and have read lately it has evolved badly.
>
> It used to be run on a shoestring with enthusiastic volunteers everywhere
> and lots of eccentric touches.  There were local craft clubs who set up on
> their niche historical displays on the weekends, there was a guy who'd
> taken over the front room of the manor with his huge Churchill memorabilia
> collection, and though things weren't fancy they were lots of fun.  Over
> the years, though, the site has been "corporatized" and while the exhibits
> have gotten fancier, some of the fun has gone away, and a lot of the
> passionate volunteers seem to have given up.
>
> My last visit was years ago, though, and I hope that what I've read about
> what's happened since is overstated.
>
> John
>
>
> On 7/4/2016 10:01 PM, Bob wrote:
>
>> Hi Dave,
>>
>> Yes, as many mentioned all the clocks are up the hill at the Observatory,
>> and very much worth the trip.  As you mention you are with your family, I
>> would like to add that yes I did cajole my family to the NMM and the
>> Observatory, but also to Bletchley Park (just a short train ride outside
>> London) and Bletchley Park was easily the most memorable.  There are
>> wonderful volunteer guides, and many interesting devices that you can get
>> up close to.  Bletchley was more like visiting a working lab than a
>> museum.  I think every time nut would enjoy Bletchley quite a bit.
>>
>> https://www.bletchleypark.org.uk/ 
>>
>> Cheers,
>>
>> Bob
>>
>> On Jul 4, 2016, at 6:31 PM, Dave Martindale 
>>> wrote:
>>>
>>> I am in London England at the moment, playing tourist with the rest of my
>>> family.  I want one day to be a visit to the National Maritime Museum at
>>> Greenwich, which includes the Royal Observatory Greenwich.  I am
>>> particularly interested in seeing Harrison's H1 through H4, plus other
>>> high-precision mechanical timekeepers (pendulum clocks, etc).
>>>
>>> I know they are at the NMM - their web site shows some of them.  But
>>> where
>>> are they located on the site?  The NMM has a large main building down
>>> near
>>> the Thames, while the Royal Observatory and related buildings are on the
>>> top of a hill further inland in Greenwich Park.  Are the chronometers and
>>> other precision timekeepers on display somewhere in the Royal
>>> Observatory,
>>> or down in the main NMM building?  I've spent an hour or two browsing web
>>> sites without finding this particular bit of information.
>>>
>>> I figure there must be list members who have visited the NMM, and know
>>> where the precision timekeepers are actually displayed.
>>>
>>> Thanks,
>>> Dave
>>> ___
>>> time-nuts mailing list -- time-nuts@febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>>
>> ___
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>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>> ___
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>> To unsubscribe, go to
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>> and follow the instructions there.
>>
>> ___
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> and follow the instructions there.
>



-- 
Mundus vult decipi.
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Re: [time-nuts] Visiting Greenwich

[Tony Finch]

Dr. David Kirkby (Kirkby Microwave Ltd)  wrote:
>
> There's an interesting clock at Cambridge university too:
>
> http://www.corpus.cam.ac.uk/about-us/the-corpus-clock/

My notes on the Corpus Clock: http://fanf.livejournal.com/98545.html

The clock in Trinity College is a smaller version of the Big Ben clock and
has its own web site with interesting technical details:
http://trin-hosts.trin.cam.ac.uk/clock/
(I suspect its keeper might be willing to show visiting time nuts around!)

Tony.
-- 
f.anthony.n.finch    http://dotat.at/  -  I xn--zr8h punycode
Malin, Hebrides: Northwest 4 or 5, becoming variable 3 or 4, then south 4 or 5
later. Moderate, occasionally slight. Showers, rain later. Good, occasionally
moderate later.
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Re: [time-nuts] Visiting Greenwich

[Oz-in-DFW]

Also worth a trip is the The Clockmakers’ Museum of the The Worshipful
Company of Clockmakers which is much more accessible now that it has
moved to a new gallery on the 2nd floor of The Science Museum. It had
restricted hours in its old location.

http://www.clockmakers.org/

On 7/4/2016 5:31 PM, Dave Martindale wrote:
> I am in London England at the moment, playing tourist with the rest of my
> family.  I want one day to be a visit to the National Maritime Museum at
> Greenwich, which includes the Royal Observatory Greenwich.  I am
> particularly interested in seeing Harrison's H1 through H4, plus other
> high-precision mechanical timekeepers (pendulum clocks, etc).

-- 
mailto:o...@ozindfw.net
Oz
POB 93167 
Southlake, TX 76092 (Near DFW Airport) 



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Re: [time-nuts] Visiting Greenwich

[Dr. David Kirkby (Kirkby Microwave Ltd)]

On 5 Jul 2016 00:43, "Dave Martindale"  wrote:
>
> I am in London England at the moment, playing tourist with the rest of my
> family.  I want one day to be a visit to the National Maritime Museum at
> Greenwich, which includes the Royal Observatory Greenwich.  I am
> particularly interested in seeing Harrison's H1 through H4, plus other
> high-precision mechanical timekeepers (pendulum clocks, etc).

There's an interesting clock at Cambridge university too:

http://www.corpus.cam.ac.uk/about-us/the-corpus-clock/

you might consider visiting.  Cambridge is not too far from London,  and a
nice place to visit,  especially on a warm sunny day when punting on the
river Cam would be particularly enjoyable.

I am sure that you will visit Big Ben.

The clocks at NPL were open to the public at the recent open day, but will
not generally be open.  But if you tried a personal phone call,  and said
that you were a tourist with a particular interest in precision
timekeeping,  you might be offered the chance to look around.

Dave.
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Re: [time-nuts] Visiting Greenwich

[John Ackermann N8UR]

I'm a bit of a crypto-geek and was able to visit Bletchley a couple of 
times, again many years ago.  It is definitely worth a trip, though from 
what I saw on my visits and have read lately it has evolved badly.


It used to be run on a shoestring with enthusiastic volunteers 
everywhere and lots of eccentric touches.  There were local craft clubs 
who set up on their niche historical displays on the weekends, there was 
a guy who'd taken over the front room of the manor with his huge 
Churchill memorabilia collection, and though things weren't fancy they 
were lots of fun.  Over the years, though, the site has been 
"corporatized" and while the exhibits have gotten fancier, some of the 
fun has gone away, and a lot of the passionate volunteers seem to have 
given up.


My last visit was years ago, though, and I hope that what I've read 
about what's happened since is overstated.


John

On 7/4/2016 10:01 PM, Bob wrote:

Hi Dave,

Yes, as many mentioned all the clocks are up the hill at the Observatory, and 
very much worth the trip.  As you mention you are with your family, I would 
like to add that yes I did cajole my family to the NMM and the Observatory, but 
also to Bletchley Park (just a short train ride outside London) and Bletchley 
Park was easily the most memorable.  There are wonderful volunteer guides, and 
many interesting devices that you can get up close to.  Bletchley was more like 
visiting a working lab than a museum.  I think every time nut would enjoy 
Bletchley quite a bit.

https://www.bletchleypark.org.uk/ 

Cheers,

Bob


On Jul 4, 2016, at 6:31 PM, Dave Martindale  wrote:

I am in London England at the moment, playing tourist with the rest of my
family.  I want one day to be a visit to the National Maritime Museum at
Greenwich, which includes the Royal Observatory Greenwich.  I am
particularly interested in seeing Harrison's H1 through H4, plus other
high-precision mechanical timekeepers (pendulum clocks, etc).

I know they are at the NMM - their web site shows some of them.  But where
are they located on the site?  The NMM has a large main building down near
the Thames, while the Royal Observatory and related buildings are on the
top of a hill further inland in Greenwich Park.  Are the chronometers and
other precision timekeepers on display somewhere in the Royal Observatory,
or down in the main NMM building?  I've spent an hour or two browsing web
sites without finding this particular bit of information.

I figure there must be list members who have visited the NMM, and know
where the precision timekeepers are actually displayed.

Thanks,
Dave
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Re: [time-nuts] Visiting Greenwich

[Tony Finch]

Tom Van Baak  wrote:
>
> "Why the Greenwich meridian moved"
> http://link.springer.com/article/10.1007/s00190-015-0844-y

Diverging further from questions of time (sorry), there are three
meridians of interest at Greenwich. Before Airy there was the Bradley
meridian, and the Bradley meridian is supposedly still used by the
Ordnance Survey.

http://www.thegreenwichmeridian.org/tgm/articles.php?article=8

However if you look at an OS map (e.g. 1:25,000 1st series,
http://maps.nls.uk/view/95750225) the grid doesn't match up with the
observatory, which I find curious.

Maybe it is to do with the grid origin not being on the meridian?
https://en.wikipedia.org/wiki/Ordnance_Survey_National_Grid

Tony.
-- 
f.anthony.n.finch    http://dotat.at/  -  I xn--zr8h punycode
Plymouth, Biscay: Variable 3 or 4, becoming north or northwest 5 at times.
Slight or moderate. Fair. Moderate or good.
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Re: [time-nuts] Visiting Greenwich

[David J Taylor]

From: jimlux

One must, of course, take a picture with one foot in each hemisphere.
(Unless, you would follow the French, in which case, the Paris meridian
is the only true meridian, and then you'd have one meter in each
hemisphere...)
___


.. and when you do that, note that your GPS doesn't read zero, as the GPS 
meridian is some 120 m further east.


Do enjoy the visit.

David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
Twitter: @gm8arv 


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Re: [time-nuts] Visiting Greenwich

[Clint Jay]

There is also the RSGB exhibition station at Bletchley which has some nice
radio principles demos
On 5 Jul 2016 08:45, "Attila Kinali"  wrote:

> On Mon, 4 Jul 2016 19:01:45 -0700
> Bob  wrote:
>
> > but also to Bletchley Park (just a short train ride outside London) and
> > Bletchley Park was easily the most memorable.  There are wonderful
> volunteer
> > guides, and many interesting devices that you can get up close to.
> > Bletchley was more like visiting a working lab than a museum.  I think
> every
> > time nut would enjoy Bletchley quite a bit.
> >
> > https://www.bletchleypark.org.uk/ 
>
> I wouldn't call it a "short train ride outside London", but then,
> I'm used to Swiss distances :-)
>
> If you go to the Bletchley Park, also visit The National Museum of
> Computing
> which is at the back of Bletchley Park ( http://www.tnmoc.org ). It's
> a volunteer operated museum with lots of old computers. They also have
> a working Colossus and a WITCH on display. If you talk to one of the
> staff, he might show you the box with all the old crystals they have
> collected and don't know what to do with :-)
>
>
> Attila Kinali
>
> --
> Malek's Law:
> Any simple idea will be worded in the most complicated way.
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Re: [time-nuts] Visiting Greenwich

[Jim Palfreyman]

I was lucky. About ten years ago when visiting I turned up to the Greenwich
Observatory and walked around the corner to see the Harrison clocks.

I didn't know they were there. I didn't know they were anywhere.

I'd read the book, seen the doco, but for some reason assumed they weren't
around any more.

To get a surprise and see them *working* was a great moment in my life.

As David Gilmour once said, "I've never had the pleasure of hearing Dark
Side of the Moon for the first time", well I got the surprise of seeing the
working Harrison clocks - and not knowing it was coming.

Brilliant!


Jim Palfreyman


On 5 July 2016 at 15:00, Peter Monta  wrote:

> Hi Dave,
>
> The Harrisons are indeed at the observatory; also look for a regulator
> pendulum clock in the octagon room.  I'm not quite sure whether it was
> running when I was there some years back.
>
> Could it hurt to petition the observatory's powers-that-be for a little hut
> or something at the ITRF meridian?  :-)
>
> If you do get to Bletchley Park, give the National Museum of Computing a
> look-see as well (it's just a short walk).  I believe both facilities have
> benefited from recent infusions of money and support, which is great.
>
> Cheers,
> Peter
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Re: [time-nuts] Visiting Greenwich

[Attila Kinali]

On Mon, 4 Jul 2016 19:01:45 -0700
Bob  wrote:

> but also to Bletchley Park (just a short train ride outside London) and 
> Bletchley Park was easily the most memorable.  There are wonderful volunteer 
> guides, and many interesting devices that you can get up close to.  
> Bletchley was more like visiting a working lab than a museum.  I think every 
> time nut would enjoy Bletchley quite a bit.
> 
> https://www.bletchleypark.org.uk/ 

I wouldn't call it a "short train ride outside London", but then,
I'm used to Swiss distances :-)

If you go to the Bletchley Park, also visit The National Museum of Computing
which is at the back of Bletchley Park ( http://www.tnmoc.org ). It's
a volunteer operated museum with lots of old computers. They also have
a working Colossus and a WITCH on display. If you talk to one of the
staff, he might show you the box with all the old crystals they have
collected and don't know what to do with :-)


Attila Kinali

-- 
Malek's Law:
Any simple idea will be worded in the most complicated way.
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Re: [time-nuts] Visiting Greenwich

[Peter Monta]

Hi Dave,

The Harrisons are indeed at the observatory; also look for a regulator
pendulum clock in the octagon room.  I'm not quite sure whether it was
running when I was there some years back.

Could it hurt to petition the observatory's powers-that-be for a little hut
or something at the ITRF meridian?  :-)

If you do get to Bletchley Park, give the National Museum of Computing a
look-see as well (it's just a short walk).  I believe both facilities have
benefited from recent infusions of money and support, which is great.

Cheers,
Peter
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Re: [time-nuts] Visiting Greenwich

[Tom Van Baak]

Hi Dave,

Last year a more up to-date and highly-technical version of the meridian 
mystery was published:

"Why the Greenwich meridian moved"
http://link.springer.com/article/10.1007/s00190-015-0844-y

See especially figure 3. The PDF is here:
http://link.springer.com/content/pdf/10.1007%2Fs00190-015-0844-y.pdf

When I was in Greenwich last year I made these plots to show the old/tourist 
meridian (red x) and the true meridian (green x):
http://leapsecond.com/pages/meridian/map-100.gif
http://leapsecond.com/pages/meridian/map-101.gif

I also brought a laptop and 3 GPS receivers with me and collected 3 x 20 
minutes of NMEA data while sitting on the old/tourist line. Sure enough, the 
mean error approached 102 meters:
http://leapsecond.com/pages/meridian/simul-5.gif

/tvb

- Original Message - 
From: "Dave Martindale" <dave.martind...@gmail.com>
To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com>
Sent: Monday, July 04, 2016 8:14 PM
Subject: Re: [time-nuts] Visiting Greenwich


> Wouldn't that be "un pied dans chaque hemisphere" in France?
> 
> I visited the Greenwich observatory a number of years ago, but it was after
> 5 PM and all of the exhibits were closed for the day.  So we only saw the
> repeater clock and the meridian line.  One interesting fact:  A GPS
> receiver will not agree with the line set into the concrete about where
> zero degrees of longitude is located.  The GPS prime meridian is somewhere
> nearby, within the park, but not at the marked line.
> 
> An explanation for this (that I found at the time) is that the line in the
> ground at the observatory is defined as zero longitude in whatever geodetic
> ellipsoid and datum the British were using at the time.  The GPS zero
> longitude line is at zero in WGS84.  Apparently WGS84 is defined to agree
> with the older British datum in longitude *at the equator*, but the two
> ellipsoids use different models of the earth's axis and so the two
> zero-longitude meridians do not agree at Greenwich's latitude of ~50 N.
> 
> Google found this more recent article:
> http://www.thegreenwichmeridian.org/tgm/articles.php?article=7 that has
> more interesting (and more detailed) information about the difference in
> the prime meridian definitions.
> 
> Dave
> 
> On Tuesday, 5 July 2016, jimlux <jim...@earthlink.net> wrote:
> 
>>
>> One must, of course, take a picture with one foot in each hemisphere.
>> (Unless, you would follow the French, in which case, the Paris meridian is
>> the only true meridian, and then you'd have one meter in each
>> hemisphere...
>>

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Re: [time-nuts] Visiting Greenwich

[Dave Martindale]

Wouldn't that be "un pied dans chaque hemisphere" in France?

I visited the Greenwich observatory a number of years ago, but it was after
5 PM and all of the exhibits were closed for the day.  So we only saw the
repeater clock and the meridian line.  One interesting fact:  A GPS
receiver will not agree with the line set into the concrete about where
zero degrees of longitude is located.  The GPS prime meridian is somewhere
nearby, within the park, but not at the marked line.

An explanation for this (that I found at the time) is that the line in the
ground at the observatory is defined as zero longitude in whatever geodetic
ellipsoid and datum the British were using at the time.  The GPS zero
longitude line is at zero in WGS84.  Apparently WGS84 is defined to agree
with the older British datum in longitude *at the equator*, but the two
ellipsoids use different models of the earth's axis and so the two
zero-longitude meridians do not agree at Greenwich's latitude of ~50 N.

Google found this more recent article:
http://www.thegreenwichmeridian.org/tgm/articles.php?article=7 that has
more interesting (and more detailed) information about the difference in
the prime meridian definitions.

Dave

On Tuesday, 5 July 2016, jimlux  wrote:

>
> One must, of course, take a picture with one foot in each hemisphere.
> (Unless, you would follow the French, in which case, the Paris meridian is
> the only true meridian, and then you'd have one meter in each
> hemisphere...
>
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Re: [time-nuts] Visiting Greenwich

[Bob]

Hi Dave,

Yes, as many mentioned all the clocks are up the hill at the Observatory, and 
very much worth the trip.  As you mention you are with your family, I would 
like to add that yes I did cajole my family to the NMM and the Observatory, but 
also to Bletchley Park (just a short train ride outside London) and Bletchley 
Park was easily the most memorable.  There are wonderful volunteer guides, and 
many interesting devices that you can get up close to.  Bletchley was more like 
visiting a working lab than a museum.  I think every time nut would enjoy 
Bletchley quite a bit.

https://www.bletchleypark.org.uk/ 

Cheers,

Bob

> On Jul 4, 2016, at 6:31 PM, Dave Martindale  wrote:
> 
> I am in London England at the moment, playing tourist with the rest of my
> family.  I want one day to be a visit to the National Maritime Museum at
> Greenwich, which includes the Royal Observatory Greenwich.  I am
> particularly interested in seeing Harrison's H1 through H4, plus other
> high-precision mechanical timekeepers (pendulum clocks, etc).
> 
> I know they are at the NMM - their web site shows some of them.  But where
> are they located on the site?  The NMM has a large main building down near
> the Thames, while the Royal Observatory and related buildings are on the
> top of a hill further inland in Greenwich Park.  Are the chronometers and
> other precision timekeepers on display somewhere in the Royal Observatory,
> or down in the main NMM building?  I've spent an hour or two browsing web
> sites without finding this particular bit of information.
> 
> I figure there must be list members who have visited the NMM, and know
> where the precision timekeepers are actually displayed.
> 
> Thanks,
> Dave
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> time-nuts mailing list -- time-nuts@febo.com
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Re: [time-nuts] Visiting Greenwich

[Tom Van Baak]

Do visit the main maritime museum down by the river. But the Harrison clocks 
are at the observatory, where the ball drops, about a 10 minute walk up the 
hill. Map here:

http://leapsecond.com/pages/meridian/

Besides H1-H4 see if you can get a peek at Clock B:

http://leapsecond.com/pend/clockb/

/tvb

- Original Message - 
From: "Dave Martindale" 
To: "Discussion of precise time and frequency measurement" 
Sent: Monday, July 04, 2016 3:31 PM
Subject: [time-nuts] Visiting Greenwich


>I am in London England at the moment, playing tourist with the rest of my
> family.  I want one day to be a visit to the National Maritime Museum at
> Greenwich, which includes the Royal Observatory Greenwich.  I am
> particularly interested in seeing Harrison's H1 through H4, plus other
> high-precision mechanical timekeepers (pendulum clocks, etc).
> 
> I know they are at the NMM - their web site shows some of them.  But where
> are they located on the site?  The NMM has a large main building down near
> the Thames, while the Royal Observatory and related buildings are on the
> top of a hill further inland in Greenwich Park.  Are the chronometers and
> other precision timekeepers on display somewhere in the Royal Observatory,
> or down in the main NMM building?  I've spent an hour or two browsing web
> sites without finding this particular bit of information.
> 
> I figure there must be list members who have visited the NMM, and know
> where the precision timekeepers are actually displayed.
> 
> Thanks,
> Dave
> ___
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Re: [time-nuts] Visiting Greenwich

[jimlux]

On 7/4/16 3:31 PM, Dave Martindale wrote:

I am in London England at the moment, playing tourist with the rest of my
family.  I want one day to be a visit to the National Maritime Museum at
Greenwich, which includes the Royal Observatory Greenwich.  I am
particularly interested in seeing Harrison's H1 through H4, plus other
high-precision mechanical timekeepers (pendulum clocks, etc).

I know they are at the NMM - their web site shows some of them.  But where
are they located on the site?  The NMM has a large main building down near
the Thames, while the Royal Observatory and related buildings are on the
top of a hill further inland in Greenwich Park.  Are the chronometers and
other precision timekeepers on display somewhere in the Royal Observatory,
or down in the main NMM building?  I've spent an hour or two browsing web
sites without finding this particular bit of information.

I figure there must be list members who have visited the NMM, and know
where the precision timekeepers are actually displayed.



Royal Observatory...

http://www.rmg.co.uk/see-do/we-recommend/attractions/john-harrisons-marine-timekeepers

http://www.rmg.co.uk/sites/default/files/rmg_map_2015_-_rog.pdf



One must, of course, take a picture with one foot in each hemisphere.
(Unless, you would follow the French, in which case, the Paris meridian 
is the only true meridian, and then you'd have one meter in each 
hemisphere...)



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Re: [time-nuts] Visiting Greenwich

[John Ackermann N8UR]

When I was there (10+ years ago) the timekeeping stuff was at the observatory, 
which is just a few minutes walk up from the NMM.  Both sites are fascinating 
and well worth spending some time.

I took a tour boat to get to Greenwich from central London -- it's the end of 
the line and if you work the times right you can get on another one for the 
return trip.  The boat ride was also well worth it.

Have fun!
John

> On Jul 4, 2016, at 6:31 PM, Dave Martindale  wrote:
> 
> I am in London England at the moment, playing tourist with the rest of my
> family.  I want one day to be a visit to the National Maritime Museum at
> Greenwich, which includes the Royal Observatory Greenwich.  I am
> particularly interested in seeing Harrison's H1 through H4, plus other
> high-precision mechanical timekeepers (pendulum clocks, etc).
> 
> I know they are at the NMM - their web site shows some of them.  But where
> are they located on the site?  The NMM has a large main building down near
> the Thames, while the Royal Observatory and related buildings are on the
> top of a hill further inland in Greenwich Park.  Are the chronometers and
> other precision timekeepers on display somewhere in the Royal Observatory,
> or down in the main NMM building?  I've spent an hour or two browsing web
> sites without finding this particular bit of information.
> 
> I figure there must be list members who have visited the NMM, and know
> where the precision timekeepers are actually displayed.
> 
> Thanks,
> Dave
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Re: [time-nuts] Visiting Greenwich

[Dan Rae]

Dave, it's been a few years since I was there but the Harrison clocks 
are not in the main part of the museum but in the Observatory which is a 
bit to the South and East if I remember right.  Both are well worth a 
look, but the Harrisons are magic of course.


Dan

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