[time-nuts] World's most precise.... wall clock

[Ben Bradley]

This might be desirable.

https://www.ebay.com/itm/THE-AMATEUR-SCIENTIST-ON-CD-ROM-LATEST-EDITION-VERSION-4-M2071-/112117678275

On Wed, Mar 3, 2021 at 4:19 PM Chris Caudle <6807.chris at pop.powweb.com> wrote:
>
> > On Tue, 02 Mar 2021 22:42:45 -0800
> > Hal Murray <hmurray at megapathdsl.net> wrote:
> >
> >> The basic idea is to mount a magnet on a stiff wire so that it sticks
> >> out to
> >> the side of the pendulum arm, then mount a coil so the magnet will
> >> swing
> >> through it.  Now pulse the coil to get the desired results.
>
> On 2021-03-03 02:54, Attila Kinali wrote:
> > This is basically injection locking of a pendulum clock.
> > Pendulum clocks are very nice for injection locking, due
> > to their relatively low Q and because a magnetic field can
> > be easily adjusted in strength.
>
>
> I don't have the reference at hand right away, but I did see an article
> in the past describing a mechanism which placed the magnet on the end of
> the pendulum, and had one coil to sense the magnet swinging past, and
> another coil to provide the impulse to the pendulum.  The timing of the
> impulse was controlled by a microcontroller, so it could provide some
> rough phase locking function by varying the time between the detection
> pulse and the driven impulse, and maybe the amplitude or length of the
> impulse.
> If there is interest I can see if I can find that article again, but
> that may be straying from the original request, which seemed to be
> looking for something with a digital display.
>
> --
> Chris Caudle
>
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