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Begin forwarded message: > From: [email protected] > Date: February 23, 2017 at 6:01:06 AM GMT-5 > To: [email protected] > Subject: sundial Digest, Vol 134, Issue 15 > Reply-To: [email protected] > > Send sundial mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.uni-koeln.de/mailman/listinfo/sundial > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of sundial digest..." > > > Today's Topics: > > 1. To Fred with friendship. I will write soon to bringing you up to date > . (Harris Morrison) > 2. Re: The duration of the year (Robert Kellogg) > 3. Re: The duration of the year (Douglas Bateman) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 22 Feb 2017 21:26:18 -0500 > From: Harris Morrison <[email protected]> > To: [email protected], Harris Morrison <[email protected]>, > Michael Thomas <[email protected]> > Subject: To Fred with friendship. I will write soon to bring you up > to date. > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii" > > I do have to bring you up to date with newest creations > When would be good time to have moment. Incidently I am looking > For a jewelry person to work with, I t is we work with an NGO WHICH I AM > QUITE DEDICATED TO"suslia dharma international" > Please do rake a moment to read it over thorouQghly. > Best regards, > Harris > I do send regards To all group S.D.I. > [email protected] > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <https://lists.uni-koeln.de/mailman/private/sundial/attachments/20170222/6723636c/attachment-0001.html> > > ------------------------------ > > Message: 2 > Date: Wed, 22 Feb 2017 22:08:23 -0500 > From: Robert Kellogg <[email protected]> > To: [email protected] > Subject: Re: The duration of the year > Message-ID: <[email protected]> > Content-Type: text/plain; charset=windows-1252; format=flowed > > > > On 2/22/2017 6:01 AM, [email protected] wrote: > Do horologists worry about Allan Variance? I do > > > ------------------------------ > > Message: 3 > Date: Thu, 23 Feb 2017 10:26:37 +0000 > From: Douglas Bateman <[email protected]> > To: Robert Kellogg <[email protected]> > Cc: Sundial list <[email protected]> > Subject: Re: The duration of the year > Message-ID: <[email protected]> > Content-Type: text/plain; charset=us-ascii > > The answer is yes, but mainly the esoteric and academic applications to > precision pendulum clocks (although Allan Variance came out of quartz > oscillator analysis). > > Electronic measuring and recording methods are necessary. In my case I made > and used an electronic stopwatch method, with radio time signals as a > reference, to take daily readings. For analysis and comparing with other > clocks with comparable data, I calculate Standard Deviation for a sample of > 30 days. > > Allan Variance is more powerful by comparing short term, medium term and > longer term data, and can differentiate between instrument sample errors, > clock stability and long term drift. The method appeals to mathematicians! > > Either way, good source data is essential. Going back to horologists, a > minority discipline. I suspect that you enjoy the subject! > > Regards, Doug > > >> On 23 Feb 2017, at 03:08, Robert Kellogg <[email protected]> wrote: >> >> >> >> On 2/22/2017 6:01 AM, [email protected] wrote: >> Do horologists worry about Allan Variance? I do >> --------------------------------------------------- >> https://lists.uni-koeln.de/mailman/listinfo/sundial >> > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > sundial mailing list > [email protected] > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > ------------------------------ > > End of sundial Digest, Vol 134, Issue 15 > ****************************************
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