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. > -- I am Pulse. Unbreakable. _______________________________________________ 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.