Re: [Phys-L] Allan deviation

[Bill Norwood <bnorwood111@gmail.com>]

It is arresting to consider the number of ticks these clocks patiently
executed with my knowing nothing at all of the clock science. Many thanks
for the education which did not endure for too many ticks.  Bill Norwood

On Mon, Jul 13, 2015 at 2:42 PM, Bernard Cleyet <bernardcleyet@redshift.com>
wrote:

> On 2015, Jul 13, , at 08:11, Bill Norwood <bnorwood111@gmail.com> wrote:
>
> > Many thanks, John, for that comprehensive explanation - I'll never look
> at
> > a pendulum clock the same way again. Thank God they never had to go
> > relativistic.
>
>
> Well ….,   they have.  The MicroSet person sells a GPS adapter for the MS.
>
>  http://www.bmumford.com/mset/tech/gps/gps3.html
>
>
> And, IIRC, Mr. Mumford has resold Rb clocks, also.
>
>
> To add to JD’s description:  Among the better formerly commercially
> available (I know of only two) clocks, the Synchronome uses a Zn sleeve.
> The bob (originally 14 pound) rests on the sleeve, which then rests on the
> rating nut, which is on the end of the rod which is Invar. [This is similar
> to the Westminster clock I previously described.]  Modern horologists use
> silica.   However, even a recent article in the Horological Science
> Newsletter describes the method to remove the Invar shadow mask from a
> color kinescope.  An early ed. of the "Amateur Telescope Making” describes
> in detail (mechanical drawings, etc.) for those wishing to make one.  Also,
> IIRC, Mr. Mumford sold the support steel casting.  All the other materials
> being readily available.
>
>
> I have put my two tower clocks Allan deviation plots here, plus a more
> complete one from Tom Van Baak, here:
>
>
> http://www.cleyet.org/Pendula,%20Horological%20and%20Otherwise/Allan_deviation_tower_clocks.pdf
>
> bc forgot about the mercury temp. compensated clocks.
>
> p.s. An horologist in Utah showed me his and one is for sale in Pacific
> Grove (near where I reside).  Being not affluent I didn’t purchase it. (~
> $1k).
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