Empathy List Archives

DM

Dave Martindale

Mon, Jul 4, 2016 10:31 PM

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

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

JA

John Ackermann N8UR

Mon, Jul 4, 2016 11:48 PM

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 dave.martindale@gmail.com 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.

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 <dave.martindale@gmail.com> 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.

DR

Dan Rae

Mon, Jul 4, 2016 11:49 PM

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

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

J

jimlux

Tue, Jul 5, 2016 12:21 AM

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...<grin>)

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...<grin>)

TV

Tom Van Baak

Tue, Jul 5, 2016 12:24 AM

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" dave.martindale@gmail.com
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
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

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.

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" <dave.martindale@gmail.com> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> 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 > _______________________________________________ > 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.

B

Bob

Tue, Jul 5, 2016 2:01 AM

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

Cheers,

Bob

On Jul 4, 2016, at 6:31 PM, Dave Martindale dave.martindale@gmail.com 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.

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/ <https://www.bletchleypark.org.uk/> Cheers, Bob > On Jul 4, 2016, at 6:31 PM, Dave Martindale <dave.martindale@gmail.com> 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 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

DM

Dave Martindale

Tue, Jul 5, 2016 3:14 AM

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 jimlux@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...<grin>

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 <jimlux@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...<grin> >

TV

Tom Van Baak

Tue, Jul 5, 2016 4:49 AM

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.martindale@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 jimlux@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...<grin>

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.martindale@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 <jimlux@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...<grin> >>

PM

Peter Monta

Tue, Jul 5, 2016 5:00 AM

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

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

AK

Attila Kinali

Tue, Jul 5, 2016 6:16 AM

On Mon, 4 Jul 2016 19:01:45 -0700
Bob bob@marinelli.org 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/ 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.

On Mon, 4 Jul 2016 19:01:45 -0700 Bob <bob@marinelli.org> 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/ <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.

JP

Jim Palfreyman

Tue, Jul 5, 2016 7:42 AM

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 pmonta@gmail.com 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

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.

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 <pmonta@gmail.com> 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 > _______________________________________________ > 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. >

CJ

Clint Jay

Tue, Jul 5, 2016 7:54 AM

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

On Mon, 4 Jul 2016 19:01:45 -0700
Bob bob@marinelli.org 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/ 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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There is also the RSGB exhibition station at Bletchley which has some nice radio principles demos On 5 Jul 2016 08:45, "Attila Kinali" <attila@kinali.ch> wrote: > On Mon, 4 Jul 2016 19:01:45 -0700 > Bob <bob@marinelli.org> 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/ <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. > _______________________________________________ > 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. >

DJ

David J Taylor

Tue, Jul 5, 2016 10:13 AM

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...<grin>)

.. 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-taylor@blueyonder.co.uk
Twitter: @gm8arv

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...<grin>) _______________________________________________ .. 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-taylor@blueyonder.co.uk Twitter: @gm8arv

TF

Tony Finch

Tue, Jul 5, 2016 10:17 AM

Tom Van Baak tvb@LeapSecond.com 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 dot@dotat.at 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.

Tom Van Baak <tvb@LeapSecond.com> 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 <dot@dotat.at> 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.

JA

John Ackermann N8UR

Tue, Jul 5, 2016 12:10 PM

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

Cheers,

Bob

On Jul 4, 2016, at 6:31 PM, Dave Martindale dave.martindale@gmail.com 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.

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/ <https://www.bletchleypark.org.uk/> > > Cheers, > > Bob > >> On Jul 4, 2016, at 6:31 PM, Dave Martindale <dave.martindale@gmail.com> 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 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. >

O

Oz-in-DFW

Tue, Jul 5, 2016 1:00 PM

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

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

WH

William H. Fite

Tue, Jul 5, 2016 4:18 PM

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 jra@febo.com 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/ https://www.bletchleypark.org.uk/

Cheers,

Bob

On Jul 4, 2016, at 6:31 PM, Dave Martindale dave.martindale@gmail.com

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.

--
Mundus vult decipi.

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 <jra@febo.com> 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/ <https://www.bletchleypark.org.uk/> >> >> Cheers, >> >> Bob >> >> On Jul 4, 2016, at 6:31 PM, Dave Martindale <dave.martindale@gmail.com> >>> 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 >> 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. > -- Mundus vult decipi.

J

jimlux

Tue, Jul 5, 2016 5:39 PM

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.

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.

DI

David I. Emery

Wed, Jul 6, 2016 2:20 AM

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 jra@febo.com 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/ https://www.bletchleypark.org.uk/

Cheers,

Bob

On Jul 4, 2016, at 6:31 PM, Dave Martindale dave.martindale@gmail.com

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.

--
Mundus vult decipi.

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.

--
Dave Emery N1PRE/AE, die@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."

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 <jra@febo.com> 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/ <https://www.bletchleypark.org.uk/> > >> > >> Cheers, > >> > >> Bob > >> > >> On Jul 4, 2016, at 6:31 PM, Dave Martindale <dave.martindale@gmail.com> > >>> 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 > >> 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. > > > > > > -- > Mundus vult decipi. > _______________________________________________ > 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. -- Dave Emery N1PRE/AE, die@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."

DI

David I. Emery

Wed, Jul 6, 2016 2:49 AM

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, die@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."

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, die@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."

time-nuts@lists.febo.com

Visiting Greenwich

David

Tony.