I would be interested in seeing the aryicles. John WA4WDL ----- Original Message ----- From: "Bill Janssen" <billj@ieee.org> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Wednesday, March 21, 2007 11:25 AM Subject: Re: [time-nuts] Hello > Tom Van Baak wrote: >>> The Shortt pendulum was of great interest - what could 70 years >>> of relentlessly advancing technology have to improve on it? >>> That is a top priority, behind consulting commitments, financial >>> management, home maintenance, building computers and looking for >>> business. Which is to say, I've bought things but haven't had any >>> time to do anything with them, like the Invar rod. >>> >> >> I would be interested if others of you time-nuts are also >> involved with pendulum clocks. At the surface it might >> seem odd that with today's technology that anyone would >> want to spend time with pendulum clocks. But there are >> several hundred guys around the world who are spending >> a great deal of time working on modern pendulum clocks. >> >> The history, science, and technology of these things is >> far, far deeper than you might think. Here I can make a >> plug for Jim's website: >> http://www.clockvault.com/heritage/index.htm >> and also have a look at Bill's amazing creations: >> http://www.precisionclocks.com/ >> >> I really like my cesium clocks, but you've got to admit >> these old (Riefler and Shortt) and new (Q1 and Q2) >> are much better eye candy and old HP or FTS clock. >> >> >> > Stuff snipped >> /tvb >> http://www.LeapSecond.com > There was a series of articles in The Home Shop Machinist starting in the > September/October 2000 issue that described construction of a Free > Pendulum clock > > I think I can find all of the articles if some one wants them > > Bill K7NOM (not really nutty about time) > > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >

It been mentioned here before; http://www.febo.com/pipermail/time-nuts/2004-September/017484.html It's a book about Alfred Loomis. I remember (forgive my old memory) reading about his use of 3 pendulum clocks and his discovering that varying the proximal distances had an effect on drift. Jack

In message <011401c76be8$32c27d20$98477760$@org>, "Jack Hudler" writes: >It been mentioned here before; >http://www.febo.com/pipermail/time-nuts/2004-September/017484.html > >It's a book about Alfred Loomis. >I remember (forgive my old memory) reading about his use of 3 pendulum >clocks and his discovering that varying the proximal distances had an effect >on drift. Wonderful book, highly recommended. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.